Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill, Gross
Balance, beginning of period	$ 68,585	$ 66,523
Foreign currency fluctuations	321	2,062
Balance, end of period	68,906	68,585	66,523
Accumulated Impairment Losses
Balance, beginning of period	(48,868)	(46,220)
Foreign currency fluctuations	(1,109)	(2,648)
Balance, end of period	(49,977)	(48,868)	(46,220)
Goodwill, Net
Balance, beginning of period	19,717	20,303
Foreign currency fluctuations	(788)	(586)
Balance, end of period	18,929	19,717	20,303
Acquired Finite-lived Intangible Assets
Original cost	35,946	35,671
Accumulated amortization	(16,918)	(14,278)
Intangible Assets, Net	19,028	21,393
Impairment of Intangible Assets			1,805
Amortization expense	2,560	2,800	3,330
Estimated aggregate amortization expense of Intangible Assets
2014	2,387
2015	2,204
2016	1,871
2017	1,768
2018	1,761
Thereafter	9,037
Total	19,028
Customer Lists and Service Contracts
Acquired Finite-lived Intangible Assets
Original cost	23,763	23,817
Accumulated amortization	(11,609)	(9,907)
Intangible Assets, Net	12,154	13,910
Weighted-average original life (in years)	15 years	15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	4,836	4,657
Accumulated amortization	(1,976)	(1,565)
Intangible Assets, Net	2,860	3,092
Weighted-average original life (in years)	14 years	14 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	7,347	7,197
Accumulated amortization	(3,333)	(2,806)
Intangible Assets, Net	$ 4,014	$ 4,391
Weighted-average original life (in years)	13 years	13 years