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, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 10,643	$ 7,294
Other comprehensive income before reclassifications	(7,611)	3,429
Amounts reclassified from accumulated other comprehensive income	(605)	(80)
Total other comprehensive income (loss), net of tax	(8,216)	3,349	(2,870)
Ending balance	2,427	10,643	7,294
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	12,785	9,994
Other comprehensive income before reclassifications	(9,292)	2,791
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss), net of tax	(9,292)	2,791
Ending balance	3,493	12,785
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,142)	(2,700)
Other comprehensive income before reclassifications	1,681	638
Amounts reclassified from accumulated other comprehensive income	(605)	(80)
Total other comprehensive income (loss), net of tax	1,076	558
Ending balance	$ (1,066)	$ (2,142)