Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended		12 Months Ended
	Nov. 30, 2013	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
IRS proposed adjustments to tax years 2000 through 2002, before penalty and interest		$ 16,500
Potential penalty, percentage of tax assessment		20.00%
Income taxes			35,253	12,432	16,020
Income Tax Examination, Tax, Penalties and Interest Expense	12,700
Leases [Abstract]
Operating Leases, Rent Expense			11,398	13,464	19,678
Operating Leases, Future Minimum Payments, Due 2014			8,581
Operating Leases, Future Minimum Payments, Due 2015			5,358
Operating Leases, Future Minimum Payments, Due 2016			1,821
Operating Leases, Future Minimum Payments, Due 2017			909
Operating Leases, Future Minimum Payments, Due 2018			683
Operating Leases, Future Minimum Payments, Due Thereafter			2,921
2013 U.S Court Decision [Member]
Loss Contingencies [Line Items]
Income taxes			$ 16,428