CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 677,170		$ 688,765		$ 720,333
Cost of services (exclusive of depreciation and amortization of $36,094, $36,248, and $39,203, respectively, included below)	533,880		510,724		493,713
Selling, general and administrative expenses	60,888		64,843		72,830
Depreciation and amortization	51,734		49,988		52,756
Impairment loss	0		183,288		0
Restructuring and related charges	1,773		9,036		10,258
Operating income (loss)	28,895		(129,114)		90,776
Gain on sale of investment	0		0		(1,163)
Interest expense	14,149		13,193		14,164
Income (loss) before income taxes	14,746		(142,307)		77,775
Income tax expense	6,722		15,386		30,445
Net income (loss)	$ 8,024		$ (157,693)		$ 47,330
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.24		$ (4.68)		$ 1.39
Diluted (in dollars per share)	$ 0.24	[1]	$ (4.68)	[1]	$ 1.36	[1]
Weighted average common shares and equivalents
Basic (in shares)	33,597		33,677		34,129
Diluted (in shares)	33,836	[1]	33,677	[1]	34,902	[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.