Summary of Significant Accounting Policies - The balances in the Company's accumulated other comprehensive income (loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 2,427	$ 10,643	$ 7,294
Other comprehensive income (loss) before reclassifications	(14,144)	(8,287)	3,284
Amounts reclassified from accumulated other comprehensive income, net of tax of ($40)(1)	29	71	65
Total other comprehensive income (loss), net of tax	(14,115)	(8,216)	3,349
Ending balance	(11,688)	2,427	10,643
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3,493	12,785	9,994
Other comprehensive income (loss) before reclassifications	(13,318)	(9,292)	2,791
Amounts reclassified from accumulated other comprehensive income, net of tax of ($40)(1)	0	0	0
Total other comprehensive income (loss), net of tax	(13,318)	(9,292)	2,791
Ending balance	(9,825)	3,493	12,785
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,066)	(2,142)	(2,700)
Other comprehensive income (loss) before reclassifications	(826)	1,005	493
Amounts reclassified from accumulated other comprehensive income, net of tax of ($40)(1)	29	71	65
Total other comprehensive income (loss), net of tax	(797)	1,076	558
Ending balance	$ (1,863)	$ (1,066)	$ (2,142)