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Consolidated Condensed Schedule of Investments (Financial Derivatives)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 20,001 $ 15,479 $ 16,788
Derivative Liability 20,806 $ 24,553 $ 27,621
Financial derivative-assets, at fair value, Net Cost 22,526    
Derivatives Proceeds (19,019)    
Financial Derivatives - Assets      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 20,001    
Investment Owned, Percent of Net Assets 3.36%    
Financial derivative-assets, at fair value, Net Cost $ 22,526    
Financial Derivatives - Liabilities      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability $ (20,806)    
Investment Owned, Percent of Net Assets (3.50%)    
Derivatives Proceeds $ (19,019)    
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- 1,003    
Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- 1,470    
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability (2,482)    
Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability (756)    
Total return swaps | Financial Derivatives - Assets | Short | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- 1    
Swap [Member] | Financial Derivatives - Assets      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 19,995    
Investment Owned, Percent of Net Assets 3.36%    
Financial derivative-assets, at fair value, Net Cost $ 22,524    
Swap [Member] | Financial Derivatives - Liabilities      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability $ (20,331)    
Investment Owned, Percent of Net Assets (3.42%)    
Derivatives Proceeds $ (19,019)    
Options | Financial Derivatives - Assets      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 0    
Investment Owned, Percent of Net Assets 0.00%    
Financial derivative-assets, at fair value, Net Cost $ 2    
US Treasury Note Futures [Member] | Short      
Investment Holdings, Other than Securities [Line Items]      
Number of contracts | contract 1,516    
Futures | Financial Derivatives - Assets      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 0    
Investment Owned, Percent of Net Assets 0.00%    
Futures | Financial Derivatives - Liabilities      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability $ (355)    
Investment Owned, Percent of Net Assets (0.06%)    
Forwards | Financial Derivatives - Assets      
Investment Holdings, Other than Securities [Line Items]      
Financial derivatives–assets, at fair value- $ 6    
Investment Owned, Percent of Net Assets 0.00%    
Forwards | Financial Derivatives - Liabilities      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability $ (120)    
Investment Owned, Percent of Net Assets (0.02%)    
Recovery swaps | Financial Derivatives - Liabilities | Long | North America [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative Liability $ (8)    
Foreign Exchange Future [Member] | Short      
Investment Holdings, Other than Securities [Line Items]      
Number of contracts | contract 411    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 47,815    
Financial derivatives–assets, at fair value- $ 733    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-06    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Assets | Long | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 2,330    
Derivative Liability $ (1,467)    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (279,163)    
Derivative Liability $ (10,090)    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-06    
Credit Risk [Member] | Credit default swaps on corporate bond indices | Financial Derivatives - Liabilities | Short | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 689    
Financial derivatives–assets, at fair value- $ 7    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Long | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2037-12    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (56,207)    
Financial derivatives–assets, at fair value- $ 8,085    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2046-05    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Assets | Short | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2059-11    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 14,838    
Derivative Liability $ (2,125)    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2049-03    
Credit Risk [Member] | Credit default swaps on asset-backed indices | Financial Derivatives - Liabilities | Long | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2060-11    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Basic Materials [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 4    
Financial derivatives–assets, at fair value- $ 0    
Derivatives Maturity Date 2022-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Communications [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 3,090    
Financial derivatives–assets, at fair value- $ 18    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Communications [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Communications [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Consumer [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 10,655    
Financial derivatives–assets, at fair value- $ 868    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Consumer [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Consumer [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Financial [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 930    
Financial derivatives–assets, at fair value- $ 104    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Industrial Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 485    
Financial derivatives–assets, at fair value- $ 13    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Energy [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Energy [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Technology Sector [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Long | North America [Member] | Technology Sector [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Basic Materials [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2021-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Basic Materials [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Communications [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (906)    
Financial derivatives–assets, at fair value- $ 226    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Communications [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2021-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Communications [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Consumer [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (2,065)    
Financial derivatives–assets, at fair value- $ 30    
Derivatives Maturity Date 2020-03    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Industrial Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (2,074)    
Financial derivatives–assets, at fair value- 25    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Energy [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional (7,610)    
Financial derivatives–assets, at fair value- $ 950    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Energy [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Energy [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Technology Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (4,070)    
Financial derivatives–assets, at fair value- $ 239    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Technology Sector [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Assets | Short | North America [Member] | Technology Sector [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2022-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Basic Materials [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 2,000    
Derivative Liability $ (25)    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Communications [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 2,313    
Derivative Liability $ (396)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Communications [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2022-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Communications [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Consumer [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 3,741    
Derivative Liability $ (62)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Consumer [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-03    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Consumer [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2021-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Energy [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 5,144    
Derivative Liability $ (1,885)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Energy [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Energy [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Technology Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 1,953    
Derivative Liability $ (114)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Technology Sector [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Long | North America [Member] | Technology Sector [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Basic Materials [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (1,180)    
Derivative Liability $ (57)    
Derivatives Maturity Date 2019-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Communications [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (3,910)    
Derivative Liability $ (11)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Communications [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Communications [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Consumer [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (12,830)    
Derivative Liability $ (567)    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Consumer [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-06    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Consumer [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Financial [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (930)    
Derivative Liability $ (104)    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Industrial Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (485)    
Derivative Liability $ (13)    
Derivatives Maturity Date 2023-12    
Credit Risk [Member] | Credit default swaps on corporate bonds | Financial Derivatives - Liabilities | Short | North America [Member] | Technology Sector [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (1,160)    
Derivative Liability $ (4)    
Derivatives Maturity Date 2019-06    
Credit Risk [Member] | Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | North America [Member] | Mortgage-related Residential [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (3,186)    
Financial derivatives–assets, at fair value- $ 1,472    
Credit Risk [Member] | Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | North America [Member] | Mortgage-related Residential [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2035-06    
Credit Risk [Member] | Credit default swaps on asset-backed securities | Financial Derivatives - Assets | Short | North America [Member] | Mortgage-related Residential [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2035-12    
Credit Risk [Member] | Total return swaps | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (11,230)    
Derivative Liability $ (6)    
Derivatives Maturity Date 2019-03    
Credit Risk [Member] | Recovery swaps | Financial Derivatives - Liabilities | Long | North America [Member] | Consumer [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 2,600    
Derivative Liability $ (8)    
Derivatives Maturity Date 2019-06    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 29,198    
Financial derivatives–assets, at fair value- $ 61    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Long | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-01    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Long | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-02    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (353,741)    
Financial derivatives–assets, at fair value- $ 7,163    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Short | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-03    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Assets | Short | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2045-12    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 113,809    
Derivative Liability $ (1,987)    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Long | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2021-06    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Long | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2029-01    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (71,672)    
Derivative Liability $ (1,406)    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Short | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-05    
Interest Rate Risk [Member] | Interest rate swaps | Financial Derivatives - Liabilities | Short | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2028-11    
Interest Rate Risk [Member] | Interest Rate Cap [Member] | Financial Derivatives - Assets | Long      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ 51,545    
Financial derivatives–assets, at fair value- $ 0    
Derivatives Maturity Date 2019-05    
Interest Rate Risk [Member] | US Treasury Note Futures [Member] | Financial Derivatives - Assets | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (151,600)    
Financial derivatives–assets, at fair value- $ 0    
Derivatives Maturity Date 2019-03    
Interest Rate Risk [Member] | Interest Rate Swaps Variable rates only [Member] | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (12,900)    
Derivative Liability $ (4)    
Derivatives Maturity Date 2019-06    
Interest Rate Risk [Member] | Eurodollar futures | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (98,000)    
Derivative Liability $ (53)    
Number Of Contracts Per Every $1,000,000 In Notional Value | contract 1    
Interest Rate Risk [Member] | Eurodollar futures | Financial Derivatives - Liabilities | Short | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-03    
Interest Rate Risk [Member] | Eurodollar futures | Financial Derivatives - Liabilities | Short | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2020-06    
Interest Rate Risk [Member] | Foreign Exchange Future [Member] | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (47,931)    
Derivative Liability $ (302)    
Derivatives Maturity Date 2019-03    
Equity Market Risk [Member] | Total return swaps | Financial Derivatives - Assets | Short | North America [Member] | Financial [Member]      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (17,740)    
Financial derivatives–assets, at fair value- $ 1    
Equity Market Risk [Member] | Total return swaps | Financial Derivatives - Assets | Short | North America [Member] | Financial [Member] | Minimum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-07    
Equity Market Risk [Member] | Total return swaps | Financial Derivatives - Assets | Short | North America [Member] | Financial [Member] | Maximum      
Investment Holdings, Other than Securities [Line Items]      
Derivatives Maturity Date 2019-10    
Currency risk [Member] | Forwards | Financial Derivatives - Assets | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (802)    
Financial derivatives–assets, at fair value- $ 6    
Derivatives Maturity Date 2019-03    
Currency risk [Member] | Forwards | Financial Derivatives - Liabilities | Short      
Investment Holdings, Other than Securities [Line Items]      
Derivative notional $ (16,497)    
Derivative Liability $ (120)    
Derivatives Maturity Date 2019-03