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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, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Customer Lists
Dec. 31, 2013
Customer Lists
Mar. 31, 2014
Trade Name
Dec. 31, 2013
Trade Name
Mar. 31, 2014
Technology
Dec. 31, 2013
Technology
Goodwill, Gross                  
Balance, beginning of period $ 68,906                
Foreign currency fluctuations 506                
Balance, end of period 69,412                
Accumulated Impairment Losses                  
Balance, beginning of period (49,977)                
Foreign currency fluctuations (274)                
Balance, end of period (50,251)                
Goodwill, Net                  
Balance, beginning of period 18,929                
Foreign currency fluctuations 232                
Balance, end of period 19,161                
Acquired Finite-lived Intangible Assets                  
Original cost 36,174   35,946 23,999 23,763 4,831 4,836 7,344 7,347
Accumulated amortization (17,668)   (16,918) (12,171) (11,609) (2,061) (1,976) (3,436) (3,333)
Intangible Assets, Net 18,506   19,028 11,828 12,154 2,770 2,860 3,908 4,014
Weighted-average original life       15 years 15 years 14 years 14 years 13 years 13 years
Amortization expense 611 644              
Estimated aggregate amortization expense of Intangible Assets                  
Remaining 2014 1,818                
2015 2,200                
2016 1,876                
2017 1,773                
2018 1,766                
Thereafter 9,073                
Total $ 18,506