Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Goodwill, Gross
Balance, beginning of period			$ 60,447
Additions			7,280
Foreign currency fluctuations			(3,715)
Balance, end of period	$ 64,012		64,012		$ 60,447
Accumulated Impairment Losses
Balance, beginning of period			(43,644)
Foreign currency fluctuations			4,301
Balance, end of period	(39,343)		(39,343)		(43,644)
Goodwill, Net
Balance, beginning of period			16,803
Additions			7,280
Foreign currency fluctuations			586
Balance, end of period	24,669		24,669		16,803
Acquired Finite-lived Intangible Assets
Original cost	11,804		11,804		30,236
Accumulated amortization	(8,917)		(8,917)		(27,041)
Intangible Assets, Net	2,887		2,887		3,195
Amortization expense	99	$ 332	323	$ 1,368
Estimated aggregate amortization expense of Intangible Assets
Remaining 2016	86		86
2017	317		317
2018	311		311
2019	311		311
2020	311		311
Thereafter	1,551		1,551
Total	2,887		2,887
Customer Lists and Service Contracts
Acquired Finite-lived Intangible Assets
Original cost	6,580		6,580		19,781
Accumulated amortization	(6,148)		(6,148)		(19,232)
Intangible Assets, Net	432		$ 432		$ 549
Weighted-average original life			15 years		15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost					$ 3,859
Accumulated amortization					(3,859)
Intangible Assets, Net					$ 0
Weighted-average original life					14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	5,224		$ 5,224		$ 6,596
Accumulated amortization	(2,769)		(2,769)		(3,950)
Intangible Assets, Net	$ 2,455		$ 2,455		$ 2,646
Weighted-average original life			13 years		13 years