Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	$ (20,939)	$ (54,595)
Other comprehensive income (loss) before reclassifications	[1]	2,794	(3,450)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(182)	(85)
Other comprehensive income (loss)	[1]	2,612	(3,535)
Ending balance	[1]	(18,327)	(58,130)
Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	(111)	(364)
Other comprehensive income (loss) before reclassifications	[1]	60	58
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0	0
Other comprehensive income (loss)	[1]	60	58
Ending balance	[1]	(51)	(306)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	(12,041)	(4,709)
Other comprehensive income (loss) before reclassifications	[1]	2,505	(3,983)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0	0
Other comprehensive income (loss)	[1]	2,505	(3,983)
Ending balance	[1]	(9,536)	(8,692)
Investment in Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	126	126
Other comprehensive income (loss) before reclassifications	[1]	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(126)	0
Other comprehensive income (loss)	[1]	(126)	0
Ending balance	[1]	0	126
Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	(8,913)	(49,648)
Other comprehensive income (loss) before reclassifications	[1]	229	475
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(56)	(85)
Other comprehensive income (loss)	[1]	173	390
Ending balance	[1]	$ (8,740)	$ (49,258)

[1] All amounts are net of tax. Amounts in parentheses indicate debits