Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2015	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		$ (127,259)	$ (85,128)
Other comprehensive loss before reclassifications		(20,944)	(63,362)
Amounts reclassified from OCI		430	717
Accumulated other comprehensive income (loss), Ending balance		(147,773)	(147,773)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	[1]	(271)	324
Other comprehensive loss before reclassifications	[1]	(664)	(1,447)
Amounts reclassified from OCI	[1]	382	570
Accumulated other comprehensive income (loss), Ending balance	[1]	(553)	(553)
Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	[1]	(5,071)	(5,170)
Other comprehensive loss before reclassifications	[1]	0	0
Amounts reclassified from OCI	[1]	48	147
Accumulated other comprehensive income (loss), Ending balance	[1]	(5,023)	(5,023)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		(121,917)	(80,282)
Other comprehensive loss before reclassifications		(20,280)	(61,915)
Amounts reclassified from OCI	[1]	0	0
Accumulated other comprehensive income (loss), Ending balance		$ (142,197)	$ (142,197)

[1] Cash Flow Hedges and Pension Items are net of tax.