Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill, Gross
Balance, beginning of period			$ 64,858
Foreign currency fluctuations			(920)
Balance, end of period	$ 63,938		63,938		$ 64,858
Accumulated Impairment Losses
Balance, beginning of period			(46,503)
Foreign currency fluctuations			235
Balance, end of period	(46,268)		(46,268)		(46,503)
Goodwill, Net
Balance, beginning of period			18,355
Foreign currency fluctuations			(685)
Balance, end of period	17,670		17,670		18,355
Acquired Finite-lived Intangible Assets
Original cost	31,951		31,951		33,161
Accumulated amortization	(17,659)		(17,659)		(17,573)
Intangible Assets, Net	14,292		14,292		15,588
Amortization expense	516	$ 612	1,036	$ 1,223
Estimated aggregate amortization expense of Intangible Assets
Remaining 2015	923		923
2016	1,705		1,705
2017	1,608		1,608
2018	1,602		1,602
2019	1,490		1,490
Thereafter	6,964		6,964
Total	14,292		14,292
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	21,322		21,322		21,946
Accumulated amortization	(12,209)		(12,209)		(12,099)
Intangible Assets, Net	9,113		$ 9,113		$ 9,847
Weighted-average original life			15 years		15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	3,960		$ 3,960		$ 4,300
Accumulated amortization	(2,048)		(2,048)		(2,068)
Intangible Assets, Net	1,912		$ 1,912		$ 2,232
Weighted-average original life			14 years		14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	6,669		$ 6,669		$ 6,915
Accumulated amortization	(3,402)		(3,402)		(3,406)
Intangible Assets, Net	$ 3,267		$ 3,267		$ 3,509
Weighted-average original life			13 years		13 years