Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended					3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Short-term Debt, Type [Domain]	Mar. 31, 2014 Capital Lease Obligations [Member]	Mar. 31, 2014 Term Loan A [Member]	Aug. 18, 2011 Term Loan A [Member]	Mar. 31, 2014 Total debt [Member]	Apr. 09, 2014 Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread Reduction									0.125%
Total Debt [Roll Forward]
Revolving Credit Facility	$ 171,384	$ 129,010
Other Debt	1,013	2,403
Capital Lease Obligations	4,763	5,233
Term Loan A	66,000	68,000					80,000
Total Debt and Capital Lease Obligations	243,160	204,646
Net borrowings (repayments)			42,426	(1,337)	(599)	(2,000)		38,490
Capital Leases, Income Statement, Interest Expense					79			79
Foreign currency exchange (gain) loss			(52)	(53)	50			(55)
Other Debt, Current	(1,013)
Capital Lease Obligations, Current	(2,309)	(2,361)
Term Loan A, Current	(9,000)
Total Debt and Capital Lease, Current	(12,322)
Revolving Credit Facility, Noncurrent	171,384
Capital Lease Obligations, Noncurrent	2,454	2,872
Term Loan A, Noncurrent	57,000
Total Debt and Capital Lease, Noncurrent	$ 230,838