Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows From Operating Activities
Net income	$ 22,393	$ 19,184
Adjustments to reconcile net income to net cash provided by operating activities
Net accretion of bond premium	3,981	3,520
Depreciation and amortization	1,785	2,285
Stock-based compensation expense	411	396
Net realized investment gains	(1,909)	(2,794)
Net cash flows from trading investments	46	(1,343)
Deferred income tax expense	460	5,011
Changes in:
Accrued investment income	296	(344)
Premiums receivable	(19,631)	(14,560)
Deferred policy acquisition costs	(2,917)	1,526
Reinsurance receivables	(5,741)	(23,199)
Prepaid reinsurance premiums	(255)	2,650
Income taxes receivable	14,150	3,926
Other assets	1,013	2,691
Future policy benefits and losses, claims and loss settlement expenses	6,364	20,596
Unearned premiums	14,670	15,228
Accrued expenses and other liabilities	(5,068)	5,721
Deferred income taxes	1,665	(3,409)
Other, net	31	(1,200)
Total adjustments	9,351	16,701
Net cash provided by operating activities	31,744	35,885
Cash Flows From Investing Activities
Proceeds from sale of available-for-sale investments	2,810	3,000
Proceeds from call and maturity of held-to-maturity investments	19	75
Proceeds from call and maturity of available-for-sale investments	127,514	149,285
Proceeds from short-term and other investments	407	2,590
Purchase of available-for-sale investments	(142,615)	(252,345)
Purchase of short-term and other investments	(900)	(2,950)
Net purchases and sales of property and equipment	(386)	(893)
Net cash used in investing activities	(13,151)	(101,238)
Cash Flows From Financing Activities
Deposits to investment and universal life contracts	25,369	40,390
Withdrawals from investment and universal life contracts	(46,219)	(33,743)
Repayment of trust preferred securities	0	(8,047)
Payment of cash dividends	(3,786)	(3,826)
Issuance of common stock	603	43
Tax impact from issuance of common stock	(78)	9
Net cash used in financing activities	(24,111)	(5,174)
Net Change in Cash and Cash Equivalents	(5,518)	(70,527)
Cash and Cash Equivalents at Beginning of Period	107,466	144,527
Cash and Cash Equivalents at End of Period	$ 101,948	$ 74,000