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Investments (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2014
$ / shares
shares
Mar. 31, 2014
$ / shares
Debt Securities, Available-for-sale [Line Items]                    
Deposit Assets $ 200     $ 200   $ 200        
Financial Instruments, Owned and Pledged as Collateral, at Fair Value 1,900     1,900   1,900        
Investments in private companies, at adjusted cost 4,620     4,620   4,870        
Real estate investments, at fair value (cost $10,225 and $10,225, respectively) 10,662 $ 10,662 $ 10,662 10,662 $ 10,662 $ 10,662 $ 10,662 $ 10,662    
(Loss) gain on change in fair value of equity investments $ (421)   0 $ 744 0          
Fixed maturities and equity investments unrealized loss positions 64,000     64,000   68,000        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 200     $ 200            
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest   26.70%                
Other investments, at cost which approximates fair value 3,316     3,316   $ 3,721        
Net (losses) gains recognized on equity investments sold during the period (10)   $ 0 245 0          
Restricted cash 13,760     13,760   14,985        
Related Party Deposit Liabilities 11,000     11,000   12,200        
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 900     900   900        
Minimum [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance | shares                 100,000  
Share Price | $ / shares                 $ 10.00  
Maximum [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Share Price | $ / shares                 $ 18.00 $ 18.00
Fair Value, Inputs, Level 1 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Other investments, at cost which approximates fair value 0     $ 0   0        
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
(Loss) gain on change in fair value of equity investments         $ (112)          
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax           146        
Fair Value, Inputs, Level 2 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Other investments, at cost which approximates fair value           3,721        
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax           $ 173        
Performance Share Grant Agreement [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance | shares                 475,000  
Clause 2 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance | shares                 125,000  
Share Price | $ / shares                 $ 12.00  
Clause 3 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Share Price | $ / shares                 $ 15.00  
Clause 1, 2 and 3 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance | shares                 350,000  
Clause 1 and 2 [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance | shares                 225,000  
Management [Member]                    
Debt Securities, Available-for-sale [Line Items]                    
Sale of Stock, Consideration Received on Transaction   $ 300                
Effect on Future Cash Flows, Amount $ 1,000                  
Net (losses) gains recognized on equity investments sold during the period   $ 300