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Supplementary Data on Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities                              
Net income $ 19,823 $ 26,923 $ 11,866 $ 25,153 $ 21,040 $ 21,984 $ 16,183 $ 34,275 $ 30,068 $ 25,357 $ 20,452 $ 28,366 $ 83,765 $ 93,482 $ 104,243
Adjustments to reconcile net income to net cash provided by operating activities:                              
Net realized investment gains                         (4,123) (12,713) (10,917)
Increase in accrued investment income                         (2,208) (2,566) (5,563)
Increase (decrease) in accrued expenses                         4,378 (5,798) 1,513
Depreciation and amortization                         6,896 7,734 7,958
Increase in insurance liabilities                         176,315 145,313 153,423
Increase in premium receivables                         (11,496) (8,641) (3,638)
Increase in deferred policy acquisition costs                         (15,859) (8,981) (12,662)
(Decrease) increase in reinsurance recoverables                         (481) (748) 1,570
Increase in income tax liabilities                         (1,293) 8,935 9,745
Debt retirement costs                         0 2,338 0
Other                         (28,476) (11,312) (23,739)
Total adjustments                         123,653 113,561 117,690
Net cash provided by operating activities                         $ 207,418 $ 207,043 $ 221,933