Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues	$ 276,622	$ 245,756	$ 559,140	$ 508,092
Cost of revenues	225,244	201,534	455,650	416,436
Selling, general and administrative expenses	24,662	19,944	48,844	41,257
Other operating income, net	(201)	(477)	(640)	(491)
Operating income	26,917	24,755	55,286	50,890
Foreign currency exchange loss	475	461	107	231
Interest expense, net	2,802	2,553	5,322	4,921
Income from operations before income taxes	23,640	21,741	49,857	45,738
Provision for income taxes	7,976	7,278	16,818	15,641
Net income	$ 15,664	$ 14,463	$ 33,039	$ 30,097
Income per common share -basic: (in Dollars per share)	$ 0.19	$ 0.16	$ 0.39	$ 0.34
Income per common share -diluted: (in Dollars per share)	$ 0.17	$ 0.15	$ 0.35	$ 0.31