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Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,426,975 $ 1,441,082
Gross Unrealized Gains 9,158 23,261
Gross Unrealized Losses (9,424) (15,287)
Estimated Fair Value 1,426,709 1,449,056
Other than temporary impairments recognized in AOCI [1] (4) (9)
Common Shares    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 119,515 100,157
Gross Unrealized Gains 3,445 16,118
Gross Unrealized Losses (2,403) (5,960)
Estimated Fair Value 120,557 110,315
Other Invested Assets    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 66,121 32,592
Estimated Fair Value 66,121 32,592
Fixed Maturities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,241,339 1,308,333
Gross Unrealized Gains 5,713 7,143
Gross Unrealized Losses (7,021) (9,327)
Estimated Fair Value 1,240,031 1,306,149
Other than temporary impairments recognized in AOCI [1] (4) (9)
Fixed Maturities | U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 71,517 106,303
Gross Unrealized Gains 763 1,140
Gross Unrealized Losses (233) (321)
Estimated Fair Value 72,047 107,122
Fixed Maturities | Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 155,402 203,121
Gross Unrealized Gains 1,423 2,576
Gross Unrealized Losses (379) (457)
Estimated Fair Value 156,446 205,240
Fixed Maturities | Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 88,131 157,753
Gross Unrealized Gains 895 2,113
Gross Unrealized Losses (558) (743)
Estimated Fair Value 88,468 159,123
Fixed Maturities | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 233,890 261,008
Gross Unrealized Gains 684 435
Gross Unrealized Losses (583) (1,421)
Estimated Fair Value 233,991 260,022
Other than temporary impairments recognized in AOCI [1] (4) (9)
Fixed Maturities | Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 184,821 142,742
Gross Unrealized Gains 118  
Gross Unrealized Losses (1,747) (2,352)
Estimated Fair Value 183,192 140,390
Fixed Maturities | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 381,209 334,720
Gross Unrealized Gains 1,666 685
Gross Unrealized Losses (2,848) (3,294)
Estimated Fair Value 380,027 332,111
Fixed Maturities | Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 126,369 102,686
Gross Unrealized Gains 164 194
Gross Unrealized Losses (673) (739)
Estimated Fair Value $ 125,860 $ 102,141
[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").