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Investments (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Security
Investment
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Security
Partnership
Investment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Security
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value $ 489,606   $ 489,606    
Cost or amortized cost 485,626   485,626    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]          
Fair value 683,773   683,773   $ 611,849
Cost or amortized cost 613,792   613,792   559,463
Gross unrealized gains 74,741   74,741   60,621
Gross unrealized losses (4,760)   (4,760)   (8,235)
Net unrealized gains (losses) $ 69,981   69,981   52,386
Applicable federal income taxes     (24,493)   (18,335)
Net unrealized gains - net of tax     $ 45,488   $ 34,051
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of securities, total | Security 408   408   486
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, total $ 292,772   $ 292,772   $ 343,800
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, total (4,760)   (4,760)   (8,235)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
One year or less, Fair Value 47,563   47,563    
Excess of one year to five years, Fair Value 272,390   272,390    
Excess of five years to ten years, Fair Value 60,122   60,122    
Excess of ten years, Fair Value 3,486   3,486    
Total contractual maturities, Fair Value 383,561   383,561    
Asset-backed securities, Fair Value 106,045   106,045    
Total, Fair Value 489,606   489,606    
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
One year or less, Cost or Amortized Cost 47,558   47,558    
Excess of one year to five years, Cost or Amortized Cost 272,639   272,639    
Excess of five years to ten years, Cost or Amortized Cost 59,322   59,322    
Excess of ten years, Cost or Amortized Cost 3,338   3,338    
Total contractual maturities, Cost or Amortized Cost 382,857   382,857    
Asset-backed securities, Cost or Amortized Cost 102,769   102,769    
Cost or amortized cost 485,626   485,626    
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Limited partnerships - net gain 2,498 $ 4,403 8,515 $ 3,201  
Net realized gains on investments 5,944 7,732 15,534 17,024  
Available for Sale Securities Gain Loss Activity [Abstract]          
Realized net gains on the disposal of securities 3,244 3,482 5,886 10,649  
Mark-to-market adjustment 171 108 136 (326)  
Equity in gains of limited partnership investments - realized and unrealized 2,498 4,403 8,515 3,201  
Impairment [Abstract]          
Write-downs based upon objective criteria (38) (1,844) (69) (4,999)  
Recovery of prior write-downs upon sale or disposal 69 1,583 1,066 8,499  
Net realized gains on investments 5,944 7,732 15,534 17,024  
Summarized financial information of significant limited partnership investments [Abstract]          
Total assets 1,297,556   1,297,556   1,154,137
Directors [Member]          
Limited Partners' Capital Account [Line Items]          
Invested assets other than limited partnership     24,229    
Agency Collateralized Mortgage Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 11,017   11,017   6,171
Cost or amortized cost 10,390   10,390   6,000
Gross unrealized gains 636   636   171
Gross unrealized losses (9)   (9)   0
Net unrealized gains (losses) 627   627   171
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 11,017   11,017   6,171
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 10,390   10,390   6,000
Agency Mortgage-backed Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 19,712   19,712   4,770
Cost or amortized cost 19,667   19,667   4,751
Gross unrealized gains 92   92   57
Gross unrealized losses (47)   (47)   (38)
Net unrealized gains (losses) 45   45   19
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 19,712   19,712   4,770
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 19,667   19,667   4,751
Asset-backed Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 50,030   50,030   45,183
Cost or amortized cost 48,969   48,969   45,207
Gross unrealized gains 1,133   1,133   458
Gross unrealized losses (72)   (72)   (482)
Net unrealized gains (losses) 1,061   1,061   (24)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 50,030   50,030   45,183
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 48,969   48,969   45,207
Bank Loans [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 24,986   24,986   10,349
Cost or amortized cost 24,914   24,914   10,222
Gross unrealized gains 182   182   149
Gross unrealized losses (110)   (110)   (22)
Net unrealized gains (losses) 72   72   127
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 24,986   24,986   10,349
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 24,914   24,914   10,222
Certificates of Deposit [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 3,138   3,138   3,117
Cost or amortized cost 3,125   3,125   3,126
Gross unrealized gains 13   13   0
Gross unrealized losses 0   0   (9)
Net unrealized gains (losses) 13   13   (9)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 3,138   3,138   3,117
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 3,125   3,125   3,126
Collateralized Mortgage Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 7,055   7,055   9,104
Cost or amortized cost 6,625   6,625   9,096
Gross unrealized gains 470   470   290
Gross unrealized losses (40)   (40)   (282)
Net unrealized gains (losses) 430   430   8
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 7,055   7,055   9,104
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 6,625   6,625   9,096
Corporate Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 165,794   165,794   142,683
Cost or amortized cost 164,965   164,965   143,356
Gross unrealized gains 2,109   2,109   1,643
Gross unrealized losses (1,280)   (1,280)   (2,316)
Net unrealized gains (losses) 829   829   (673)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 165,794   165,794   142,683
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 164,965   164,965   143,356
Mortgage-backed Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 20,643   20,643   24,571
Cost or amortized cost 19,534   19,534   23,904
Gross unrealized gains 1,508   1,508   1,132
Gross unrealized losses (399)   (399)   (465)
Net unrealized gains (losses) 1,109   1,109   667
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 20,643   20,643   24,571
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 19,534   19,534   23,904
Municipal Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 102,805   102,805   129,335
Cost or amortized cost 102,272   102,272   130,204
Gross unrealized gains 744   744   391
Gross unrealized losses (211)   (211)   (1,260)
Net unrealized gains (losses) 533   533   (869)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 102,805   102,805   129,335
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 102,272   102,272   130,204
Non-U.S. Government Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 32,942   32,942   24,681
Cost or amortized cost 33,399   33,399   26,461
Gross unrealized gains 512   512   230
Gross unrealized losses (969)   (969)   (2,010)
Net unrealized gains (losses) (457)   (457)   (1,780)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 32,942   32,942   24,681
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 33,399   33,399   26,461
U.S. Government Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 51,484   51,484   91,940
Cost or amortized cost 51,766   51,766   92,234
Gross unrealized gains 20   20   74
Gross unrealized losses (302)   (302)   (368)
Net unrealized gains (losses) (282)   (282)   (294)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 51,484   51,484   91,940
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 51,766   51,766   92,234
Total Fixed Maturities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 489,606   489,606   491,904
Cost or amortized cost 485,626   485,626   494,561
Gross unrealized gains 7,419   7,419   4,595
Gross unrealized losses (3,439)   (3,439)   (7,252)
Net unrealized gains (losses) $ 3,980   $ 3,980   $ (2,657)
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of securities, 12 months or less | Security 325   325   397
Number of securities, Greater than 12 months | Security 47   47   54
Number of securities, total | Security 372   372   451
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, 12 months or less $ 233,926   $ 233,926   $ 291,048
Fair value, Greater than 12 months 25,633   25,633   32,054
Fair value, total 259,559   259,559   323,102
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, 12 months or less (1,999)   (1,999)   (4,380)
Gross unrealized loss, Greater than 12 months (1,440)   (1,440)   (2,872)
Gross unrealized loss, total (3,439)   (3,439)   (7,252)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 489,606   489,606   491,904
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 485,626   485,626   494,561
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Gross gains 3,852 7,496 9,544 9,338  
Gross losses (4,011) (8,434) (10,160) (12,470)  
Net realized gains (losses) (159) (938) (616) (3,132)  
Consumer [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 41,913   41,913   32,576
Cost or amortized cost 19,749   19,749   15,231
Gross unrealized gains 22,728   22,728   17,656
Gross unrealized losses (564)   (564)   (311)
Net unrealized gains (losses) 22,164   22,164   17,345
Energy [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 8,168   8,168   12,842
Cost or amortized cost 5,454   5,454   5,641
Gross unrealized gains 2,795   2,795   7,203
Gross unrealized losses (81)   (81)   (2)
Net unrealized gains (losses) 2,714   2,714   7,201
Financial [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 42,596   42,596   31,186
Cost or amortized cost 29,780   29,780   22,417
Gross unrealized gains 13,213   13,213   8,998
Gross unrealized losses (397)   (397)   (229)
Net unrealized gains (losses) 12,816   12,816   8,769
Industrial [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 23,972   23,972   21,145
Cost or amortized cost 7,825   7,825   6,239
Gross unrealized gains 16,293   16,293   15,098
Gross unrealized losses (146)   (146)   (192)
Net unrealized gains (losses) 16,147   16,147   14,906
Technology [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 11,825   11,825   8,858
Cost or amortized cost 5,452   5,452   4,117
Gross unrealized gains 6,373   6,373   4,769
Gross unrealized losses 0   0   (28)
Net unrealized gains (losses) 6,373   6,373   4,741
Mutual Fund [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 58,178   58,178   6,995
Cost or amortized cost 55,025   55,025   6,930
Gross unrealized gains 3,163   3,163   121
Gross unrealized losses (10)   (10)   (56)
Net unrealized gains (losses) 3,153   3,153   65
Other [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 7,515   7,515   6,343
Cost or amortized cost 4,881   4,881   4,327
Gross unrealized gains 2,757   2,757   2,181
Gross unrealized losses (123)   (123)   (165)
Net unrealized gains (losses) 2,634   2,634   2,016
Total Equity Securities [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 194,167   194,167   119,945
Cost or amortized cost 128,166   128,166   64,902
Gross unrealized gains 67,322   67,322   56,026
Gross unrealized losses (1,321)   (1,321)   (983)
Net unrealized gains (losses) $ 66,001   $ 66,001   $ 55,043
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of securities, 12 months or less | Security 36   36   35
Number of securities, Greater than 12 months | Security 0   0   0
Number of securities, total | Security 36   36   35
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, 12 months or less $ 33,213   $ 33,213   $ 20,698
Fair value, Greater than 12 months 0   0   0
Fair value, total 33,213   33,213   20,698
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, 12 months or less (1,321)   (1,321)   (983)
Gross unrealized loss, Greater than 12 months 0   0   0
Gross unrealized loss, total (1,321)   (1,321)   $ (983)
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Gross gains 4,103 5,086 8,601 21,722  
Gross losses (498) (819) (966) (4,767)  
Net realized gains (losses) 3,605 4,267 7,635 16,955  
Limited Partnership [Member]          
Limited Partners' Capital Account [Line Items]          
Undistributed earnings of limited partnership, net of taxes 30,293   30,293    
Total investment in limited partnerships $ 40,169   $ 40,169    
Number of partnerships investment | Partnership     2    
Number of significant investments in public and private equity market in India | Investment 1   1    
Significant investment in public and private equity markets in India, value $ 26,970 29,718 $ 26,970 29,718  
Estimated ownership interest in significant limited partnership investment     5.00%    
Earnings from limited partnership investment     $ 4,817 1,448  
Summarized financial information of significant limited partnership investments [Abstract]          
Total assets 517,411 487,784 517,411 487,784  
Total partners' capital $ 517,411 $ 487,784 517,411 487,784  
Net increase in partners' capital resulting from operations     $ 95,314 $ 23,841