Other Income (Expense), net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of other income (expense), net
Other income (expense), net	$ 8,103	$ 4,072	$ (1,225)
Program fees on the sale of accounts receivable
Components of other income (expense), net
Other income (expense), net			(1,539)
Agency and commitment fees
Components of other income (expense), net
Other income (expense), net	(1,192)	(1,656)	(1,842)
Interest income
Components of other income (expense), net
Other income (expense), net	10,245	5,046	2,154
Other
Components of other income (expense), net
Other income (expense), net	$ (950)	$ 682	$ 2