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Fair Value of Financial Instruments (Fair Value Measurements for Level 3 Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period $ 194,731 $ 120,644
Total realized and unrealized gains (losses):    
Included in net income (44,394) 61,206
Purchases 22,376 16,442
Sales 0 0
Issuances 0 0
Settlements (56,357) (48,444)
Transfers into (out of) Level 3 0 0
Balance at end of period 116,356 149,848
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,337) 54,545
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 226,401 134,693
Total realized and unrealized gains (losses):    
Included in net income (43,428) 64,174
Purchases 22,376 16,442
Sales 0 0
Issuances 0 230
Settlements (57,847) (48,531)
Transfers into (out of) Level 3 0 0
Balance at end of period 147,502 167,008
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,880) 55,095
Debt Securities, Available for Sale    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 0 0
Total realized and unrealized gains (losses):    
Included in net income 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into (out of) Level 3 0 0
Balance at end of period 0 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Equity Securities    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 0 0
Total realized and unrealized gains (losses):    
Included in net income 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into (out of) Level 3 0 0
Balance at end of period 0 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Derivatives, index options    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 194,731 120,644
Total realized and unrealized gains (losses):    
Included in net income (44,394) 61,206
Purchases 22,376 16,442
Sales 0 0
Issuances 0 0
Settlements (56,357) (48,444)
Transfers into (out of) Level 3 0 0
Balance at end of period 116,356 149,848
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,337) 54,545
Net investment income    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,337) 54,545
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Net investment income | Debt Securities, Available for Sale    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Net investment income | Equity Securities    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Net investment income | Derivatives, index options    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,337) 54,545
Benefits and expenses    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (44,880) 55,095
Benefits and expenses | Debt Securities, Available for Sale    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Benefits and expenses | Equity Securities    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0
Benefits and expenses | Derivatives, index options    
Total realized and unrealized gains (losses):    
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: $ 0 $ 0