Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 261,193	$ 179,278	$ 694,666	$ 521,428
Cost of revenues	201,272	145,224	539,185	424,041
Selling, general and administrative expenses	20,802	16,662	57,770	47,435
Other operating income, net	(60)	(2,140)	(1,012)	(3,185)
Operating income	39,179	19,532	98,723	53,137
Foreign currency exchange loss (gain)	485	1,184	340	(640)
Interest expense, net	2,464	3,278	6,821	7,654
Income from operations before income taxes	36,230	15,070	91,562	46,123
Provision for income taxes	13,233	6,836	33,431	19,267
Net income	$ 22,997	$ 8,234	$ 58,131	$ 26,856
Income per common share - basic	$ 0.25	$ 0.09	$ 0.65	$ 0.30
Income per common share - diluted	$ 0.23	$ 0.09	$ 0.58	$ 0.30