Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues	$ 775,615		$ 616,016		$ 521,237
Costs and expenses:
Costs of revenues	497,038		405,329		344,051
Selling, general and administrative expenses	171,197		133,870		113,510
Depreciation and amortization	60,280	[1],[2]	62,748	[1],[2]	58,551	[1],[2]
Total costs and expenses	728,515		601,947		516,112
Income from operations	47,100		14,069		5,125
Interest and other expenses, net:
Interest expense, net	31,977		29,531		27,968
Other (income) expense, net	194		211		(226)
Gain on interest rate swap			(101)		(225)
Realized foreign currency loss					534
Total interest and other expenses, net	32,171		29,641		28,051
Income (loss) before income taxes	14,929		(15,572)		(22,926)
Provision (benefit) for income taxes	4,435		(5,356)		(7,987)
Net income (loss)	10,494		(10,216)		(14,939)
Comprehensive Income (Loss):
Net income (loss)	10,494		(10,216)		(14,939)
Foreign currency translation adjustments, net of tax	(8,439)		(9,120)		4,612
Total comprehensive income (loss)	$ 2,055		$ (19,336)		$ (10,327)
Net income (loss) per share:
Basic (in Dollars per share)	$ 0.27		$ (0.29)		$ (0.44)
Diluted (in Dollars per share)	$ 0.25		$ (0.29)		$ (0.44)
Weighted average number of common shares outstanding:
Basic (in Shares)	38,656		35,315		34,141
Diluted (in Shares)	41,232		35,315		34,141

[1] For segment purposes, the Company defines segment profit as earnings before interest expenses, income taxes, depreciation and amortization, share-based compensation expenses, acquisition related transaction costs and other expenses. A consolidated reconciliation from segment profit to income from operations is included below.

[2] Long-lived assets are noncurrent assets excluding deferred tax assets and deferred financing costs.