Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2010		$ 716,424	$ 87,318	$ 136,147	$ 415,981	$ 76,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(12,104)			(12,104)
Summary of other changes
Compensation expense and related tax benefit for stock based award grants				945
Stock repurchased (323,597 shares)			(1,078)	(5,004)
Stock issued for stock-based awards (8,255 shares)			27	112
Dividends on common stock ($0.30 per share)					(7,840)
Change in net unrealized appreciation	[1]					12,455
Change in underfunded status of employee benefit plans						836
All other changes in stockholders' equity accounts		453
Balance at Jun. 30, 2011		$ 704,773	$ 86,267	$ 132,200	$ 396,037	$ 90,269

[1] The change in net unrealized appreciation is net of reclassification adjustments.