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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Goodwill Gross    
Balance, beginning of period $ 68,585  
Foreign currency fluctuations (2,863)  
Balance, end of period 65,722 68,585
Goodwill Accumulated Impairment Losses    
Balance, beginning of period (48,868)  
Foreign currency fluctuations 2,944  
Balance, end of period (45,924) (48,868)
Goodwill Total    
Balance, beginning of period 19,717  
Foreign currency fluctuations 81  
Balance, end of period 19,798 19,717
Acquired Finite-Lived Intangible Assets    
Original cost 34,406 35,671
Accumulated amortization (14,477) (14,278)
Carrying amount 19,929 21,393
Amortization expense on Intangible Assets 644 776
Estimated aggregate amortization expense of Intangible Assets    
Remaining 2013 1,536  
2014 2,033  
2015 2,003  
2016 2,003  
2017 1,838  
Thereafter 10,516  
Total 19,929  
Customer Lists and Service Contracts
    
Acquired Finite-Lived Intangible Assets    
Original cost 22,771 23,817
Accumulated amortization (10,032) (9,907)
Carrying amount 12,739 13,910
Weighted-average original life (in years) 15 years 15 years
Trade Name
    
Acquired Finite-Lived Intangible Assets    
Original cost 4,538 4,657
Accumulated amortization (1,608) (1,565)
Carrying amount 2,930 3,092
Weighted-average original life (in years) 14 years 14 years
Technology
    
Acquired Finite-Lived Intangible Assets    
Original cost 7,097 7,197
Accumulated amortization (2,837) (2,806)
Carrying amount $ 4,260 $ 4,391
Weighted-average original life (in years) 13 years 13 years