CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2009	$ 0	$ 34	$ 222,472	$ 158,880	$ 0	$ (4,109)	$ 377,277
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	0	0	0	47,330	0	676	48,006
Repurchases of common stock	0	0	0	0	(4,494)	0	(4,494)
Exercise of stock options	0	0	1,133	0	0	0	1,133
Tax effect of stock options and restricted stock units	0	0	(2,531)	0	0	0	(2,531)
Share-based employee compensation expense	0	0	11,450	0	0	0	11,450
Balance at Dec. 31, 2010	0	34	232,524	206,210	(4,494)	(3,433)	430,841
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	0	0	0	(157,693)	0	1,644	(156,049)
Repurchases of common stock	0	(2)	0	0	(23,688)	0	(23,690)
Exercise of stock options	0	1	4,824	0	0	0	4,825
Tax effect of stock options and restricted stock units	0	0	(2,719)	0	0	0	(2,719)
Share-based employee compensation expense	0	0	9,246	0	0	0	9,246
Issuance of stock in conjunction with acquisition	0	0	3,262	0	0	0	3,262
Balance at Dec. 31, 2011	0	33	247,137	48,517	(28,182)	(1,789)	265,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	0	0	0	8,024	0	860	8,884
Exercise of stock options	0	1	2,834	0	0	0	2,835
Tax effect of stock options and restricted stock units	0	0	(5,043)	0	0	0	(5,043)
Share-based employee compensation expense	0	0	6,371	0	0	0	6,371
Issuance of stock in conjunction with acquisition	0	0	58	0	0	0	58
Balance at Dec. 31, 2012	$ 0	$ 34	$ 251,357	$ 56,541	$ (28,182)	$ (929)	$ 278,821