CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 742,183		$ 663,285		$ 677,170
Cost of services (exclusive of depreciation and amortization of $37,741, $36,183, and $36,094, respectively, included below)	598,280		547,387		533,880
Selling, general and administrative expenses	65,377		61,205		60,888
Depreciation and amortization	53,378		52,791		51,734
Legal settlement charges	17,715		0		0
Restructuring and related charges	0		0		1,773
Operating income	7,433		1,902		28,895
Interest expense	17,581		16,079		14,149
Income (loss) before income taxes	(10,148)		(14,177)		14,746
Income tax expense (benefit)	(4,587)		(5,636)		6,722
Net income (loss)	(5,561)		(8,541)		8,024
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.16)		$ (0.25)		$ 0.24
Diluted (in dollars per share)	$ (0.16)	[1]	$ (0.25)	[1]	$ 0.24
Comprehensive Income (Loss)	$ (7,202)		$ (8,019)		$ 8,884
Weighted average common shares and equivalents
Basic (in shares)	35,302		34,489		33,597
Diluted (in shares)	35,302	[1]	34,489	[1]	33,836

[1] The assumed exercise of stock-based compensation awards for the years ended December 31, 2014 and December 31, 2013 was not considered because the impact would be anti-dilutive.