Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	$ (85,128)
Other comprehensive loss before reclassifications	(61,665)
Amounts reclassified from OCI	226
Accumulated other comprehensive income (loss), Ending balance	(146,567)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	324	[1]
Other comprehensive loss before reclassifications	(106)	[1]
Amounts reclassified from OCI	177	[1]
Accumulated other comprehensive income (loss), Ending balance	395	[1]
Pension Items [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	(5,170)	[1]
Other comprehensive loss before reclassifications	0	[1]
Amounts reclassified from OCI	49	[1]
Accumulated other comprehensive income (loss), Ending balance	(5,121)	[1]
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance	(80,282)
Other comprehensive loss before reclassifications	(61,559)
Amounts reclassified from OCI	0
Accumulated other comprehensive income (loss), Ending balance	$ (141,841)

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