Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Customer Lists and Service Contracts [Member]	Dec. 31, 2011 Customer Lists and Service Contracts [Member]	Mar. 31, 2012 Trade Name [Member]	Dec. 31, 2011 Trade Name [Member]	Mar. 31, 2012 Technology [Member]	Dec. 31, 2011 Technology [Member]
Goodwill Gross [Roll Forward]
Balance, beginning of period	$ 66,523
Foreign currency fluctuations	1,537
Balance, end of period	68,060
Goodwill Accumulated Impairment Losses [Roll Forward]
Balance, beginning of period	(46,220)
Foreign currency fluctuations	(1,398)
Balance, end of period	(47,618)
Goodwill Net [Roll Forward]
Balance, beginning of period	20,303
Foreign currency fluctuations	139
Balance, end of period	20,442
Acquired Finite-Lived Intangible Assets [Line Items]
Original cost	36,400		37,706	24,465	25,987	4,701	4,583	7,234	7,136
Accumulated amortization	(12,868)		(13,948)	(9,022)	(10,387)	(1,325)	(1,209)	(2,521)	(2,352)
Carrying amount	23,532		23,758	15,443	15,600	3,376	3,374	4,713	4,784
Weighted-average original life (in years)				15	14	14	14	13	13
Amortization expense on Intangible Assets	776	832
Estimated aggregate amortization expense of Intangible Assets [Abstract]
Remaining 2012	1,792
2013	2,385
2014	2,322
2015	2,309
2016	2,269
Thereafter	12,455
Total	$ 23,532