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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 |  |  |  |  |  |  |  |

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