Debt Obligations (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Total Debt [Roll Forward]
Revolving Credit Facility	$ 41,386	$ 5,316
Other Debt	6,441	6,035
Capital Lease Obligations	5,910	4,364
Convertible Debt	345,357	337,986
Term Loan A	68,437	72,187
Total Debt and Capital Lease Obligations	467,531	425,888
Other Debt, Current	(5,740)
Capital Lease Obligations, Current	(1,905)	(2,216)
Term Loan A, Current	(6,563)
Total Debt and Capital Lease, Current	(14,208)
Revolving Credit Facility, Noncurrent	41,386
Other Notes Payable, Noncurrent	701
Capital Lease Obligations, Noncurrent	4,005	$ 2,148
Convertible Debt, Noncurrent	345,357
Term Loan A, Noncurrent	61,874
Total Debt and Capital Lease, Noncurrent	453,323
Amortization of Debt Discount (Premium)	7,371
Revolving Credit Facility [Member]
Total Debt [Roll Forward]
Net borrowings (repayments)	32,572
Foreign currency exchange gain	3,498
Short-term Debt, Type [Domain]
Total Debt [Roll Forward]
Net borrowings (repayments)	1,080
Foreign currency exchange gain	(674)
Capital Lease Obligations [Member]
Total Debt [Roll Forward]
Net borrowings (repayments)	1,611
Capital Leases Interest	265
Foreign currency exchange gain	(330)
Term Loan A [Member]
Total Debt [Roll Forward]
Net borrowings (repayments)	(3,750)
Foreign currency exchange gain	0
Total debt [Member]
Total Debt [Roll Forward]
Net borrowings (repayments)	31,513
Capital Leases Interest	265
Foreign currency exchange gain	$ 2,494