Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Customer Lists and Service Contracts	Dec. 31, 2012 Customer Lists and Service Contracts	Sep. 30, 2013 Trade Name	Dec. 31, 2012 Trade Name	Sep. 30, 2013 Technology	Dec. 31, 2012 Technology
Goodwill Gross
Balance, beginning of period			$ 68,585
Foreign currency fluctuations			(475)
Balance, end of period	68,110		68,110
Goodwill Accumulated Impairment Losses
Balance, beginning of period			(48,868)
Foreign currency fluctuations			4
Balance, end of period	(48,864)		(48,864)
Goodwill Total
Balance, beginning of period			19,717
Foreign currency fluctuations			(471)
Balance, end of period	19,246		19,246
Acquired Finite-Lived Intangible Assets
Original cost	35,579		35,579		35,671	23,538	23,817	4,758	4,657	7,283	7,197
Accumulated amortization	(16,168)		(16,168)		(14,278)	(11,130)	(9,907)	(1,858)	(1,565)	(3,180)	(2,806)
Carrying amount	19,411		19,411		21,393	12,408	13,910	2,900	3,092	4,103	4,391
Weighted-average original life (in years)						15 years	15 years	14 years	14 years	13 years	13 years
Amortization expense on Intangible Assets	633	663	1,914	2,095
Estimated aggregate amortization expense of Intangible Assets
Remaining 2013	478		478
2014	1,912		1,912
2015	1,896		1,896
2016	1,894		1,894
2017	1,863		1,863
Thereafter	11,368		11,368
Total	$ 19,411		$ 19,411