CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 688,765		$ 720,333		$ 717,426
Cost of services (exclusive of depreciation and amortization of $36,248, $39,203, and $35,433, respectively, included below)	510,724		493,713		522,999
Selling, general and administrative expenses	64,843		72,830		71,535
Depreciation and amortization	49,988		52,756		49,289
Impairment loss	183,288		0		0
Restructuring and related charges	9,036		10,258		0
Operating income (loss)	(129,114)		90,776		73,603
Gain on sale of investment	0		(1,163)		(2,581)
Interest expense	13,193		14,164		15,717
Legal settlement and related costs	0		0		39,956
Income (loss) before income taxes	(142,307)		77,775		20,511
Income tax expense	15,386		30,445		10,137
Net income (loss)	$ (157,693)		$ 47,330		$ 10,374
Earnings (loss) per share:
Basic (in dollars per share)	$ (4.68)		$ 1.39		$ 0.31
Diluted (in dollars per share)	$ (4.68)	[1]	$ 1.36	[1]	$ 0.30	[1]
Weighted average common shares and equivalents
Basic (in shares)	33,677		34,129		33,730
Diluted (in shares)	33,677	[1]	34,902	[1]	34,359	[1]

[1] The assumed exercise of stock-based compensation awards for the year ended December 31, 2011 was not considered because the impact would be anti-dilutive.