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Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,441,082 $ 1,405,419
Gross Unrealized Gains 23,261 40,666
Gross Unrealized Losses (15,287) (6,899)
Estimated Fair Value 1,449,056 1,439,186
Other than temporary impairments recognized in AOCI [1] (9) (17)
Common Shares    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 100,157 99,297
Gross Unrealized Gains 16,118 25,689
Gross Unrealized Losses (5,960) (2,938)
Estimated Fair Value 110,315 122,048
Other Invested Assets    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,592 33,174
Gross Unrealized Gains   489
Estimated Fair Value 32,592 33,663
Fixed Maturities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,308,333 1,272,948
Gross Unrealized Gains 7,143 14,488
Gross Unrealized Losses (9,327) (3,961)
Estimated Fair Value 1,306,149 1,283,475
Other than temporary impairments recognized in AOCI [1] (9) (17)
Fixed Maturities | U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 106,303 78,569
Gross Unrealized Gains 1,140 2,281
Gross Unrealized Losses (321) (83)
Estimated Fair Value 107,122 80,767
Fixed Maturities | Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 203,121 188,452
Gross Unrealized Gains 2,576 3,718
Gross Unrealized Losses (457) (697)
Estimated Fair Value 205,240 191,473
Fixed Maturities | Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 157,753 205,814
Gross Unrealized Gains 2,113 3,709
Gross Unrealized Losses (743) (764)
Estimated Fair Value 159,123 208,759
Other than temporary impairments recognized in AOCI [1]   (4)
Fixed Maturities | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 261,008 177,853
Gross Unrealized Gains 435 713
Gross Unrealized Losses (1,421) (303)
Estimated Fair Value 260,022 178,263
Other than temporary impairments recognized in AOCI [1] (9) (13)
Fixed Maturities | Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 142,742 133,984
Gross Unrealized Gains   21
Gross Unrealized Losses (2,352) (847)
Estimated Fair Value 140,390 133,158
Fixed Maturities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 334,720 380,704
Gross Unrealized Gains 685 3,421
Gross Unrealized Losses (3,294) (709)
Estimated Fair Value 332,111 383,416
Fixed Maturities | Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 102,686 107,572
Gross Unrealized Gains 194 625
Gross Unrealized Losses (739) (558)
Estimated Fair Value $ 102,141 $ 107,639
[1] Represents the total amount of other than temporary impairment losses relating to factors other than credit losses recognized in accumulated other comprehensive income ("AOCI").