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Investments (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2014
$ / shares
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 4,615       4,615   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  
Gain on change in fair value of equity investments $ 337     $ 0 $ 1,081 0        
Fixed maturities and equity investments unrealized loss positions 64,000       64,000   68,000      
Limited liability investments $ 5,316       $ 5,316   $ 9,094      
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      
Restricted Cash 14,167       14,167   14,985      
Related Party Deposit Liabilities 11,400       11,400   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
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]                    
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] | 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]                    
Gain on change in fair value of equity investments 1,000       $ 1,300          
Sale of Stock, Consideration Received on Transaction $ 1,000 300 $ 300              
Effect on Future Cash Flows, Amount   $ 1,000