Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss)
Balance as of beginning of year, net of tax	$ (27,510)	$ (1,140)
Other comprehensive income (loss) before reclassifications	(9,524)	(34)
Amounts reclassified from other comprehensive income (loss)	282	154
Net current period other comprehensive income (loss)	(9,242)	120
Balance as of end of period, net of tax	(36,752)	(1,020)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss)
Balance as of beginning of year, net of tax	1,943	16,793
Other comprehensive income (loss) before reclassifications	(10,296)	124
Net current period other comprehensive income (loss)	(10,296)	124
Balance as of end of period, net of tax	(8,353)	16,917
Defined Benefit Pension Plan Adjustments
Accumulated Other Comprehensive Income (Loss)
Balance as of beginning of year, net of tax	(30,358)	(18,450)
Other comprehensive income (loss) before reclassifications	310	(23)
Amounts reclassified from other comprehensive income (loss)	500	225
Net current period other comprehensive income (loss)	810	202
Balance as of end of period, net of tax	(29,548)	(18,248)
Derivatives
Accumulated Other Comprehensive Income (Loss)
Balance as of beginning of year, net of tax	905	517
Other comprehensive income (loss) before reclassifications	462	(135)
Amounts reclassified from other comprehensive income (loss)	(218)	(71)
Net current period other comprehensive income (loss)	244	(206)
Balance as of end of period, net of tax	$ 1,149	$ 311