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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Customer Lists
Dec. 31, 2013
Customer Lists
Sep. 30, 2014
Trade Name
Dec. 31, 2013
Trade Name
Sep. 30, 2014
Technology
Dec. 31, 2013
Technology
Goodwill, Gross                      
Balance, beginning of period     $ 68,906                
Foreign currency fluctuations     (1,780)                
Balance, end of period 67,126   67,126                
Accumulated Impairment Losses                      
Balance, beginning of period     (49,977)                
Foreign currency fluctuations     1,576                
Balance, end of period (48,401)   (48,401)                
Goodwill, Net                      
Balance, beginning of period     18,929                
Foreign currency fluctuations     (204)                
Balance, end of period 18,725   18,725                
Acquired Finite-lived Intangible Assets                      
Original cost 34,463   34,463   35,946 22,933 23,763 4,481 4,836 7,049 7,347
Accumulated amortization (17,783)   (17,783)   (16,918) (12,297) (11,609) (2,074) (1,976) (3,412) (3,333)
Intangible Assets, Net 16,680   16,680   19,028 10,636 12,154 2,407 2,860 3,637 4,014
Weighted-average original life           15 years 15 years 14 years 14 years 13 years 13 years
Amortization expense 589 633 1,812 1,914              
Estimated aggregate amortization expense of Intangible Assets                      
Remaining 2014 576   576                
2015 2,111   2,111                
2016 1,803   1,803                
2017 1,701   1,701                
2018 1,694   1,694                
Thereafter 8,795   8,795                
Total $ 16,680   $ 16,680