Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Goodwill Gross
Balance, beginning of period			$ 68,585
Foreign currency fluctuations			(3,292)
Balance, end of period	65,293		65,293	68,585
Goodwill Accumulated Impairment Losses
Balance, beginning of period			(48,868)
Foreign currency fluctuations			2,838
Balance, end of period	(46,030)		(46,030)	(48,868)
Goodwill Total
Balance, beginning of period			19,717
Foreign currency fluctuations			(454)
Balance, end of period	19,263		19,263	19,717
Acquired Finite-Lived Intangible Assets
Original cost	34,211		34,211	35,671
Accumulated amortization	(14,966)		(14,966)	(14,278)
Carrying amount	19,245		19,245	21,393
Amortization expense on Intangible Assets	637	656	1,281	1,432
Estimated aggregate amortization expense of Intangible Assets
Remaining 2013	968		968
2014	1,932		1,932
2015	1,903		1,903
2016	1,903		1,903
2017	1,845		1,845
Thereafter	10,694		10,694
Total	19,245		19,245
Customer Lists and Service Contracts
Acquired Finite-Lived Intangible Assets
Original cost	22,467		22,467	23,817
Accumulated amortization	(10,278)		(10,278)	(9,907)
Carrying amount	12,189		12,189	13,910
Weighted-average original life (in years)			15 years	15 years
Trade Name
Acquired Finite-Lived Intangible Assets
Original cost	4,597		4,597	4,657
Accumulated amortization	(1,712)		(1,712)	(1,565)
Carrying amount	2,885		2,885	3,092
Weighted-average original life (in years)			14 years	14 years
Technology
Acquired Finite-Lived Intangible Assets
Original cost	7,147		7,147	7,197
Accumulated amortization	(2,976)		(2,976)	(2,806)
Carrying amount	$ 4,171		$ 4,171	$ 4,391
Weighted-average original life (in years)			13 years	13 years