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Supplementary Data on Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities                              
Net income $ 31,826 $ 32,266 $ 13,103 $ 26,671 $ 32,913 $ 23,637 $ (11,851) $ 25,807 $ 14,592 $ 19,886 $ 23,381 $ 22,272 $ 103,866 $ 70,506 $ 80,131
Adjustments to reconcile net income to net cash provided by operating activities:                              
Realized investment gains                         (27,298) (37,663) (23,769)
Increase in accrued investment income                         (2,618) (7,348) (1,586)
Increase (decrease) in accrued expenses                         13,589 (9,203) (865)
Depreciation and amortization                         7,892 8,577 8,318
Increase in insurance liabilities                         127,992 105,576 126,868
Increase in premium receivables                         (5,638) (1,263) (2,797)
Increase in deferred policy acquisition costs                         (13,989) (6,258) (9,539)
(Increase) decrease in reinsurance recoverable                         872 (2,877) (203)
Increase in income tax liabilities                         29,752 17,953 1,184
Other                         (31,572) (22,121) (19,988)
Total adjustments                         98,982 45,373 77,623
Net cash provided by operating activities                         $ 202,848 $ 115,879 $ 157,754