Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill, Gross
Balance, beginning of period			$ 64,858
Foreign currency fluctuations			(3,244)
Balance, end of period	$ 61,614		61,614		$ 64,858
Accumulated Impairment Losses
Balance, beginning of period			(46,503)
Foreign currency fluctuations			1,711
Balance, end of period	(44,792)		(44,792)		(46,503)
Goodwill, Net
Balance, beginning of period			18,355
Foreign currency fluctuations			(1,533)
Balance, end of period	16,822		16,822		18,355
Acquired Finite-lived Intangible Assets
Original cost	30,887		30,887		33,161
Accumulated amortization	(16,990)		(16,990)		(17,573)
Accumulated impairment losses	(10,577)		(10,577)
Intangible Assets, Net	3,320		3,320		15,588
Amortization expense	332	$ 589	1,368	$ 1,812
Impairment loss recorded on intangible assets			10,577
Estimated aggregate amortization expense of Intangible Assets
Remaining 2015	179		179
2016	343		343
2017	316		316
2018	311		311
2019	310		310
Thereafter	1,861		1,861
Total	3,320		3,320
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	20,241		20,241		21,946
Accumulated amortization	(11,385)		(11,385)		(12,099)
Accumulated impairment losses	(8,245)		(8,245)
Intangible Assets, Net	611		$ 611		$ 9,847
Weighted-average original life			15 years		15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	3,970		$ 3,970		$ 4,300
Accumulated amortization	(2,110)		(2,110)		(2,068)
Accumulated impairment losses	(1,860)		(1,860)
Intangible Assets, Net	0		$ 0		$ 2,232
Weighted-average original life			14 years		14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	6,676		$ 6,676		$ 6,915
Accumulated amortization	(3,495)		(3,495)		(3,406)
Accumulated impairment losses	(472)		(472)
Intangible Assets, Net	$ 2,709		$ 2,709		$ 3,509
Weighted-average original life			13 years		13 years