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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, 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 |  |  |  |  |  |  |  |

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