Charge from Realignment of Senior Management (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management	$ 3,610	$ 0	$ 0	$ (3,100)
Cost of Services [Member]
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management	540
Selling, general and administrative [Member]
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management	$ 3,070