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Investments, Summary of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Fair value   $ 723,616
Cost or amortized cost   651,768
Gross unrealized gains   78,904
Gross unrealized losses   (7,056)
Net unrealized gains (losses)   71,848
Fixed Income Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value $ 592,645  
Cost or amortized cost 600,504  
Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 10,687 [1] 16,586
Cost or amortized cost 10,636 [1] 15,839
Gross unrealized gains 145 [1] 818
Gross unrealized losses (94) [1] (71)
Net unrealized gains (losses) 51 [1] 747
Agency Mortgage Backed Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 37,385 [1] 27,075
Cost or amortized cost 37,168 [1] 27,180
Gross unrealized gains 371 [1] 47
Gross unrealized losses (154) [1] (152)
Net unrealized gains (losses) 217 [1] (105)
Asset-backed Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 64,422 [1] 43,469
Cost or amortized cost 66,241 [1] 42,861
Gross unrealized gains 14 [1] 749
Gross unrealized losses (1,833) [1] (141)
Net unrealized gains (losses) (1,819) [1] 608
Bank Loans [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 9,750 [1] 19,488
Cost or amortized cost 10,208 [1] 19,271
Gross unrealized gains 27 [1] 266
Gross unrealized losses (485) [1] (49)
Net unrealized gains (losses) (458) [1] 217
Certificates of Deposit [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 2,835 [1] 3,135
Cost or amortized cost 2,835 [1] 3,124
Gross unrealized gains 0 [1] 11
Gross unrealized losses 0 [1] 0
Net unrealized gains (losses) 0 [1] 11
Collateralized Mortgage Obligations [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 5,423 [1] 6,492
Cost or amortized cost 5,095 [1] 6,079
Gross unrealized gains 376 [1] 451
Gross unrealized losses (48) [1] (38)
Net unrealized gains (losses) 328 [1] 413
Corporate Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 190,450 [1] 198,349
Cost or amortized cost 196,925 [1] 198,419
Gross unrealized gains 127 [1] 1,602
Gross unrealized losses (6,602) [1] (1,672)
Net unrealized gains (losses) (6,475) [1] (70)
Mortgage-backed Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 38,540 [1] 24,204
Cost or amortized cost 38,586 [1] 23,656
Gross unrealized gains 377 [1] 933
Gross unrealized losses (423) [1] (385)
Net unrealized gains (losses) (46) [1] 548
Municipal Obligations [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 29,155 [1] 96,650
Cost or amortized cost 29,102 [1] 97,059
Gross unrealized gains 239 [1] 322
Gross unrealized losses (186) [1] (731)
Net unrealized gains (losses) 53 [1] (409)
Non-U.S. Government Obligations [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 25,180 [1] 37,394
Cost or amortized cost 25,339 [1] 37,971
Gross unrealized gains 6 [1] 475
Gross unrealized losses (165) [1] (1,052)
Net unrealized gains (losses) (159) [1] (577)
U.S. Government Obligations [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 178,818 [1] 49,011
Cost or amortized cost 178,369 [1] 49,558
Gross unrealized gains 1,252 [1] 0
Gross unrealized losses (803) [1] (547)
Net unrealized gains (losses) 449 [1] (547)
Total Fixed Income Securities [Member]    
Available-for-sale Debt Securities [Abstract]    
Fair value 592,645 [1] 521,853
Cost or amortized cost 600,504 [1] 521,017
Gross unrealized gains 2,934 [1] 5,674
Gross unrealized losses (10,793) [1] (4,838)
Net unrealized gains (losses) $ (7,859) [1] 836
Consumer [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   46,578
Cost or amortized cost   23,565
Gross unrealized gains   24,031
Gross unrealized losses   (1,018)
Net unrealized gains (losses)   23,013
Energy [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   10,278
Cost or amortized cost   6,763
Gross unrealized gains   3,602
Gross unrealized losses   (87)
Net unrealized gains (losses)   3,515
Financial [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   45,470
Cost or amortized cost   31,859
Gross unrealized gains   13,937
Gross unrealized losses   (326)
Net unrealized gains (losses)   13,611
Industrial [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   25,402
Cost or amortized cost   8,949
Gross unrealized gains   16,793
Gross unrealized losses   (340)
Net unrealized gains (losses)   16,453
Technology [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   13,061
Cost or amortized cost   5,768
Gross unrealized gains   7,401
Gross unrealized losses   (108)
Net unrealized gains (losses)   7,293
Funds (e.g. mutual funds, closed end funds, ETFs) [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   50,291
Cost or amortized cost   46,177
Gross unrealized gains   4,153
Gross unrealized losses   (39)
Net unrealized gains (losses)   4,114
Other [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   10,683
Cost or amortized cost   7,670
Gross unrealized gains   3,313
Gross unrealized losses   (300)
Net unrealized gains (losses)   3,013
Total Equity Securities [Member]    
Available-for-sale Equity Securities [Abstract]    
Fair value   201,763
Cost or amortized cost   130,751
Gross unrealized gains   73,230
Gross unrealized losses   (2,218)
Net unrealized gains (losses)   $ 71,012
[1] Effective January 1, 2018, the Company adopted ASU 2016-01 and equity securities are no longer classified as available-for-sale. Prior periods have not been restated to conform to the current presentation. See Note A - Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements for further discussion.