Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 Short-term Debt, Type [Domain]	Jun. 30, 2014 Capital Lease Obligations [Member]	Jun. 30, 2014 Term Loan A [Member]	Jun. 30, 2014 Total debt [Member]
Total Debt [Roll Forward]
Revolving Credit Facility	$ 326,996	$ 129,010
Other Debt	5,960	2,403
Capital Lease Obligations	4,144	5,233
Term Loan A	74,062	68,000
Total Debt and Capital Lease Obligations	411,162	204,646
Other Debt, Current	(5,960)
Capital Lease Obligations, Current	(2,215)	(2,361)
Term Loan A, Current	(4,219)
Total Debt and Capital Lease, Current	(12,394)
Revolving Credit Facility, Noncurrent	326,996
Capital Lease Obligations, Noncurrent	1,929	2,872
Term Loan A, Noncurrent	69,843
Total Debt and Capital Lease, Noncurrent	398,768
Net borrowings (repayments)			197,191	3,597	(1,275)	6,062	205,575
Capital Leases Interest					153		153
Foreign currency exchange (gain) loss			$ 795	$ (40)	$ 33	$ 0	$ 788