Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 10,921,000
Other comprehensive (loss) income before reclassifications	(5,828,000)
Amounts reclassified from accumulated other comprehensive income (loss)	72,000
Net other comprehensive (loss) income	(5,756,000)	116,000	1,033,000
Balance, end of period	5,165,000	10,921,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	19,281,000
Other comprehensive (loss) income before reclassifications	276,000
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net other comprehensive (loss) income	276,000	(815,000)	80,000
Balance, end of period	19,557,000	19,281,000
Defined Benefit Pension Plan Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(8,360,000)
Other comprehensive (loss) income before reclassifications	(6,104,000)
Amounts reclassified from accumulated other comprehensive income (loss)	72,000
Net other comprehensive (loss) income	(6,032,000)	931,000	953,000
Balance, end of period	(14,392,000)	(8,360,000)
Accumulated other comprehensive income (loss), tax effect related to defined benefit pension plan adjustments	$ (300,000)	$ (300,000)