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Investments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Security
Partnership
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Security
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value $ 508,802    
Cost or amortized cost 507,952    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]      
Fair value 644,316   $ 611,849
Cost or amortized cost 583,722   559,463
Gross unrealized gains 66,590   60,621
Gross unrealized losses (5,996)   (8,235)
Net unrealized gains (losses) 60,594   52,386
Applicable federal income taxes (21,208)   (18,335)
Net unrealized gains - net of tax $ 39,386   $ 34,051
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]      
Number of Securities, total | Security 457   486
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair value, total $ 304,169   $ 343,800
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Gross unrealized loss, total (5,996)   (8,235)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
One year or less, Fair Value 71,509    
Excess of one year to five years, Fair Value 291,246    
Excess of five years to ten years, Fair Value 44,862    
Excess of ten years, Fair Value 4,667    
Total contractual maturities, Fair Value 412,284    
Asset-backed securities, Fair Value 96,518    
Total, Fair Value 508,802    
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
One year or less, Cost or Amortized Cost 71,658    
Excess of one year to five years, Cost or Amortized Cost 292,665    
Excess of five years to ten years, Cost or Amortized Cost 44,194    
Excess of ten years, Cost or Amortized Cost 4,612    
Total contractual maturities, Cost or Amortized Cost 413,129    
Asset-backed securities, Cost or Amortized Cost 94,823    
Cost or amortized cost 507,952    
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Limited partnerships - net gain (loss) 5,286 $ (2,179)  
Net realized gains on investments 6,294 9,012  
Available for Sale Securities Gain Loss Activity [Abstract]      
Realized net gains on the disposal of securities 399 8,309  
Mark-to-market adjustment (284) (301)  
Equity in gains (losses) of limited partnership investments - realized and unrealized 5,286 (2,179)  
Impairment [Abstract]      
Write-downs based upon objective criteria 0 (2,060)  
Recovery of prior write-downs upon sale or disposal 893 5,243  
Net realized gains on investments 6,294 9,012  
Undistributed earnings of limited partnership, net of taxes 28,312    
Total investment in limited partnerships $ 37,737    
Number of partnerships investment | Partnership 2    
Investment assets other than limited partnership $ 23,531    
Agency Collateralized Mortgage Obligations [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 7,446   6,171
Cost or amortized cost 7,065   6,000
Gross unrealized gains 381   171
Gross unrealized losses 0   0
Net unrealized gains (losses) 381   171
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 7,446   6,171
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 7,065   6,000
Agency Mortgage Backed Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 10,693   4,770
Cost or amortized cost 10,683   4,751
Gross unrealized gains 54   57
Gross unrealized losses (44)   (38)
Net unrealized gains (losses) 10   19
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 10,693   4,770
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 10,683   4,751
Asset-backed Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 48,241   45,183
Cost or amortized cost 47,306   45,207
Gross unrealized gains 1,015   458
Gross unrealized losses (80)   (482)
Net unrealized gains (losses) 935   (24)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 48,241   45,183
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 47,306   45,207
Bank Loans [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 9,144   10,349
Cost or amortized cost 9,041   10,222
Gross unrealized gains 120   149
Gross unrealized losses (17)   (22)
Net unrealized gains (losses) 103   127
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 9,144   10,349
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 9,041   10,222
Certificates of Deposit [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 3,119   3,117
Cost or amortized cost 3,125   3,126
Gross unrealized gains 0   0
Gross unrealized losses (6)   (9)
Net unrealized gains (losses) (6)   (9)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 3,119   3,117
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 3,125   3,126
Collateralized Mortgage Obligations [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 6,119   9,104
Cost or amortized cost 6,034   9,096
Gross unrealized gains 262   290
Gross unrealized losses (177)   (282)
Net unrealized gains (losses) 85   8
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 6,119   9,104
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 6,034   9,096
Corporate Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 182,308   142,683
Cost or amortized cost 181,917   143,356
Gross unrealized gains 2,056   1,643
Gross unrealized losses (1,665)   (2,316)
Net unrealized gains (losses) 391   (673)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 182,308   142,683
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 181,917   143,356
Mortgage-backed Securities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 24,019   24,571
Cost or amortized cost 23,735   23,904
Gross unrealized gains 880   1,132
Gross unrealized losses (596)   (465)
Net unrealized gains (losses) 284   667
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 24,019   24,571
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 23,735   23,904
Municipal Obligations [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 128,883   129,335
Cost or amortized cost 128,818   130,204
Gross unrealized gains 621   391
Gross unrealized losses (556)   (1,260)
Net unrealized gains (losses) 65   (869)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 128,883   129,335
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 128,818   130,204
Non-U.S. Government Obligations [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 21,428   24,681
Cost or amortized cost 22,545   26,461
Gross unrealized gains 254   230
Gross unrealized losses (1,371)   (2,010)
Net unrealized gains (losses) (1,117)   (1,780)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 21,428   24,681
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 22,545   26,461
U.S. Government Obligations [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 67,402   91,940
Cost or amortized cost 67,683   92,234
Gross unrealized gains 60   74
Gross unrealized losses (341)   (368)
Net unrealized gains (losses) (281)   (294)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 67,402   91,940
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 67,683   92,234
Total Fixed Maturities [Member]      
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]      
Fair value 508,802   491,904
Cost or amortized cost 507,952   494,561
Gross unrealized gains 5,703   4,595
Gross unrealized losses (4,853)   (7,252)
Net unrealized gains (losses) $ 850   $ (2,657)
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]      
Number of Securities, 12 months or less | Security 375   397
Number of Securities, Greater than 12 months | Security 36   54
Number of Securities, total | Security 411   451
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair value, 12 months or less $ 258,128   $ 291,048
Fair value, Greater than 12 months 10,003   32,054
Fair value, total 268,131   323,102
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Gross unrealized loss, 12 months or less (3,133)   (4,380)
Gross unrealized loss, Greater than 12 months (1,720)   (2,872)
Gross unrealized loss, total (4,853)   (7,252)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]      
Total, Fair Value 508,802   491,904
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]      
Cost or amortized cost 507,952   494,561
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross gains 888 1,277  
Gross losses (1,373) (2,896)  
Net realized gains (losses) (485) (1,619)  
Consumer [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 41,624   32,576
Cost or amortized cost 21,194   15,231
Gross unrealized gains 20,825   17,656
Gross unrealized losses (395)   (311)
Net unrealized gains (losses) 20,430   17,345
Energy [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 11,025   12,842
Cost or amortized cost 5,552   5,641
Gross unrealized gains 5,514   7,203
Gross unrealized losses (41)   (2)
Net unrealized gains (losses) 5,473   7,201
Financial [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 35,109   31,186
Cost or amortized cost 25,836   22,417
Gross unrealized gains 9,522   8,998
Gross unrealized losses (249)   (229)
Net unrealized gains (losses) 9,273   8,769
Industrial [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 24,147   21,145
Cost or amortized cost 7,981   6,239
Gross unrealized gains 16,336   15,098
Gross unrealized losses (170)   (192)
Net unrealized gains (losses) 16,166   14,906
Technology [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 9,518   8,858
Cost or amortized cost 3,933   4,117
Gross unrealized gains 5,585   4,769
Gross unrealized losses 0   (28)
Net unrealized gains (losses) 5,585   4,741
Mutual Fund [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 7,311   6,995
Cost or amortized cost 6,930   6,930
Gross unrealized gains 472   121
Gross unrealized losses (91)   (56)
Net unrealized gains (losses) 381   65
Other [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 6,780   6,343
Cost or amortized cost 4,344   4,327
Gross unrealized gains 2,633   2,181
Gross unrealized losses (197)   (165)
Net unrealized gains (losses) 2,436   2,016
Total Equity Securities [Member]      
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]      
Fair value 135,514   119,945
Cost or amortized cost 75,770   64,902
Gross unrealized gains 60,887   56,026
Gross unrealized losses (1,143)   (983)
Net unrealized gains (losses) $ 59,744   $ 55,043
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]      
Number of Securities, 12 months or less | Security 46   35
Number of Securities, Greater than 12 months | Security 0   0
Number of Securities, total | Security 46   35
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair value, 12 months or less $ 36,038   $ 20,698
Fair value, Greater than 12 months 0   0
Fair value, total 36,038   20,698
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Gross unrealized loss, 12 months or less (1,143)   (983)
Gross unrealized loss, Greater than 12 months 0   0
Gross unrealized loss, total (1,143)   $ (983)
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross gains 1,606 15,510  
Gross losses (113) (2,700)  
Net realized gains (losses) $ 1,493 $ 12,810