Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 245,756	$ 230,822	$ 508,092	$ 433,473
Cost of revenues	201,534	178,911	416,436	337,913
Selling, general and administrative expenses	19,944	21,150	41,257	36,968
Other operating income, net	(477)	(835)	(491)	(952)
Operating income	24,755	31,596	50,890	59,544
Foreign currency exchange loss (gain)	461	(468)	231	(145)
Interest expense, net	2,553	2,100	4,921	4,357
Income from operations before income taxes	21,741	29,964	45,738	55,332
Provision for income taxes	7,278	10,684	15,641	20,198
Net income	$ 14,463	$ 19,280	$ 30,097	$ 35,134
Income per common share -basic: (in Dollars per share)	$ 0.16	$ 0.21	$ 0.34	$ 0.39
Income per common share -diluted: (in Dollars per share)	$ 0.15	$ 0.19	$ 0.31	$ 0.35