CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	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, 2008	$ 34	$ 213,461	$ 148,506	$ 0	$ (4,965)	$ 357,036
Comprehensive income:
Net income (loss)	0	0	10,374	0	0	10,374
Net change in fair value of interest rate swaps, net of income taxes	0	0	0	0	2,418	2,418
Change in fair value of investment, net of income taxes	0	0	0	0	(71)	(71)
Sale of investment, net of income taxes	0	0	0	0	(1,536)	(1,536)
Foreign currency translation adjustment	0	0	0	0	45	45
Total comprehensive income (loss)						11,230
Repurchase of stock options	0	(736)	0	0	0	736
Exercise of stock options	0	727	0	0	0	727
Tax effect of stock options and restricted stock units	0	(1,193)	0	0	0	(1,193)
Share-based employee compensation expense	0	10,213	0	0	0	10,213
Balance at Dec. 31, 2009	34	222,472	158,880	0	(4,109)	377,277
Comprehensive income:
Net income (loss)	0	0	47,330	0	0	47,330
Net change in fair value of interest rate swaps, net of income taxes	0	0	0	0	20	20
Foreign currency translation adjustment	0	0	0	0	656	656
Total comprehensive income (loss)						48,006
Repurchase of stock options						0
Exercise of stock options	0	1,133	0	0	0	1,133
Tax effect of stock options and restricted stock units	0	(2,531)	0	0	0	(2,531)
Share-based employee compensation expense	0	11,450	0	0	0	11,450
Repurchases of common stock	0	0	0	(4,494)	0	(4,494)
Balance at Dec. 31, 2010	34	232,524	206,210	(4,494)	(3,433)	430,841
Comprehensive income:
Net income (loss)	0	0	(157,693)	0	0	(157,693)
Net change in fair value of interest rate swaps, net of income taxes	0	0	0	0	1,714	1,714
Foreign currency translation adjustment	0	0	0	0	(70)	(70)
Total comprehensive income (loss)						(156,049)
Repurchase of stock options						0
Exercise of stock options	1	4,825	0	0	0	4,825
Tax effect of stock options and restricted stock units	0	(2,719)	0	0	0	(2,719)
Share-based employee compensation expense	0	9,246	0	0	0	9,246
Issuance of stock in conjunction with Navvis acquisition	0	3,262	0	0	0	3,262
Repurchases of common stock	(2)	0	0	(23,688)	0	(23,690)
Balance at Dec. 31, 2011	$ 33	$ 247,137	$ 48,517	$ (28,182)	$ (1,789)	$ 265,716