Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Customer Lists	Dec. 31, 2013 Customer Lists	Jun. 30, 2014 Trade Name	Dec. 31, 2013 Trade Name	Jun. 30, 2014 Technology	Dec. 31, 2013 Technology
Goodwill, Gross
Balance, beginning of period			$ 68,906
Foreign currency fluctuations			1,679
Balance, end of period	70,585		70,585
Accumulated Impairment Losses
Balance, beginning of period			(49,977)
Foreign currency fluctuations			(1,313)
Balance, end of period	(51,290)		(51,290)
Goodwill, Net
Balance, beginning of period			18,929
Foreign currency fluctuations			366
Balance, end of period	19,295		19,295
Acquired Finite-lived Intangible Assets
Original cost	36,581		36,581		35,946	24,451	23,763	4,807	4,836	7,323	7,347
Accumulated amortization	(18,445)		(18,445)		(16,918)	(12,783)	(11,609)	(2,138)	(1,976)	(3,524)	(3,333)
Intangible Assets, Net	18,136		18,136		19,028	11,668	12,154	2,669	2,860	3,799	4,014
Weighted-average original life						15 years	15 years	14 years	14 years	13 years	13 years
Amortization expense	612	637	1,223	1,281
Estimated aggregate amortization expense of Intangible Assets
Remaining 2014	1,220		1,220
2015	2,231		2,231
2016	1,897		1,897
2017	1,794		1,794
2018	1,787		1,787
Thereafter	9,207		9,207
Total	$ 18,136		$ 18,136