Accrued Expense and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Expenses And Other Current Liabilities [Abstract]
Salaries and employee benefits payable	$ 22,702	$ 17,650
Taxes payable and related reserves	10,180	7,181
Other	10,962	12,042
Total	$ 43,844	$ 36,873