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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 176,216 $ 178,846
Obligations of U.S. states and political subdivisions 1,734,606 2,152,524
Corporate debt securities 2,255,065 2,066,838
ABS 70,935 4,923
RMBS 154,963 181,849
CMBS 270,220 297,312
CLOs 307,607 101,023
Total fixed income securities 4,969,612 4,983,315
Equity securities 7,720 7,246
Total investments at fair value 4,977,332 4,990,561
Real estate acquired 12,339 12,713
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities and obligations of U.S. government corporations and agencies 29,584 81,598
Obligations of U.S. states and political subdivisions 0 0
Corporate debt securities 0 0
ABS 0 0
RMBS 0 0
CMBS 0 0
CLOs 0 0
Total fixed income securities 29,584 81,598
Equity securities 2,889 2,978
Total investments at fair value 32,473 84,576
Real estate acquired 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities and obligations of U.S. government corporations and agencies 146,632 97,248
Obligations of U.S. states and political subdivisions 1,734,529 2,152,253
Corporate debt securities 2,255,065 2,066,838
ABS 70,935 4,923
RMBS 154,963 181,849
CMBS 270,220 297,312
CLOs 307,607 101,023
Total fixed income securities 4,939,951 4,901,446
Equity securities 0 0
Total investments at fair value 4,939,951 4,901,446
Real estate acquired 0 0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities and obligations of U.S. government corporations and agencies 0 0
Obligations of U.S. states and political subdivisions 77 271
Corporate debt securities 0 0
ABS 0 0
RMBS 0 0
CMBS 0 0
CLOs 0 0
Total fixed income securities 77 271
Equity securities 4,831 4,268
Total investments at fair value 4,908 4,539
Real estate acquired $ 12,339 $ 12,713