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Operations and Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) location | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 123,950 |  |  | $ 123,881 | $ 123,881 |  |  | $ 129,218 | $ 123,881 | $ 129,218 | $ 129,218
Margin by which the reporting units passed the annual goodwill impairment test |  |  |  |  |  |  |  |  |  |  |
Discount Rate Increases (as a percent) |  |  |  |  |  |  |  |  | 4.80% |  |
CAGR Decreases (as a percent) |  |  |  |  |  |  |  |  | 1.05% |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill at beginning of period, gross |  |  |  | 147,961 |  |  |  | 152,768 | $ 147,961 | 152,768 |
Accumulated impairment losses, beginning of period |  |  |  | (24,080) |  |  |  | (23,550) | (24,080) | (23,550) |
Goodwill at the beginning of the period, net |  |  |  | $ 123,881 |  |  |  | 129,218 | 123,881 | 129,218 |
Goodwill acquired |  |  |  |  |  |  |  |  | 2,070 |  |
Foreign exchange |  |  |  |  |  |  |  |  | (2,001) | (4,728) |
Impairment | 0 | $ 0 | $ 0 |  | (38) | $ (492) | $ 0 | 0 | 0 | (530) | 0
Reclassifications |  |  |  |  |  |  |  |  |  | (79) |
Goodwill at end of period, gross | 148,031 |  |  |  | 147,961 |  |  |  | 148,031 | 147,961 | 152,768
Accumulated impairment losses, end of period | (24,081) |  |  |  | (24,080) |  |  |  | (24,081) | (24,080) | (23,550)
Goodwill at the end of the period, net | 123,950 |  |  |  | 123,881 |  |  |  | $ 123,950 | 123,881 | 129,218
Bierbach GmbH and Co KG |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  | $ (500) |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of locations into which the activities will be consolidated | location |  |  |  |  |  |  |  |  | 4 |  |
Australia |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of locations into which the activities will be consolidated | location |  |  |  |  |  |  |  |  | 3 |  |
S&P Clever |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Number of locations into which the activities will be consolidated | location |  |  |  |  |  |  |  |  | 8 |  |
Marginal percentage by which the company passed annual impairment test |  |  |  |  |  |  |  |  | 9.00% |  |
Goodwill | 6,400 |  |  |  |  |  |  |  | $ 6,400 |  |
Margin by which the reporting units passed the annual goodwill impairment test |  |  |  |  |  |  |  |  |  |  |
Pre-Tax Operating Margin Decreases (as a percent) |  |  |  |  |  |  |  |  | 40.00% |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill at the end of the period, net | 6,400 |  |  |  |  |  |  |  | $ 6,400 |  |
North America |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Goodwill | 85,834 |  |  | $ 84,526 | 84,526 |  |  | 84,822 | 84,526 | 84,822 | 84,822
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill at beginning of period, gross |  |  |  | 95,192 |  |  |  | 95,488 | 95,192 | 95,488 |
Accumulated impairment losses, beginning of period |  |  |  | (10,666) |  |  |  | (10,666) | (10,666) | (10,666) |
Goodwill at the beginning of the period, net |  |  |  | 84,526 |  |  |  | 84,822 | 84,526 | 84,822 |
Goodwill acquired |  |  |  |  |  |  |  |  | 1,860 |  |
Foreign exchange |  |  |  |  |  |  |  |  | (552) | (296) |
Impairment |  |  |  |  |  |  |  |  | 0 |  |
Reclassifications |  |  |  |  |  |  |  |  |  | 0 |
Goodwill at end of period, gross | 96,500 |  |  |  | 95,192 |  |  |  | 96,500 | 95,192 | 95,488
Accumulated impairment losses, end of period | (10,666) |  |  |  | (10,666) |  |  |  | (10,666) | (10,666) | (10,666)
Goodwill at the end of the period, net | 85,834 |  |  |  | 84,526 |  |  |  | 85,834 | 84,526 | 84,822
Europe |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Goodwill | 36,720 |  |  | 37,788 | 37,788 |  |  | 42,690 | 37,788 | 42,690 | 42,690
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill at beginning of period, gross |  |  |  | 51,202 |  |  |  | 55,574 | 51,202 | 55,574 |
Accumulated impairment losses, beginning of period |  |  |  | (13,414) |  |  |  | (12,884) | (13,414) | (12,884) |
Goodwill at the beginning of the period, net |  |  |  | 37,788 |  |  |  | 42,690 | 37,788 | 42,690 |
Goodwill acquired |  |  |  |  |  |  |  |  | 210 |  |
Foreign exchange |  |  |  |  |  |  |  |  | (1,278) | (4,293) |
Impairment |  |  |  |  |  |  |  |  |  | (530) |
Reclassifications |  |  |  |  |  |  |  |  |  | (79) |
Goodwill at end of period, gross | 50,135 |  |  |  | 51,202 |  |  |  | 50,135 | 51,202 | 55,574
Accumulated impairment losses, end of period | (13,415) |  |  |  | (13,414) |  |  |  | (13,415) | (13,414) | (12,884)
Goodwill at the end of the period, net | 36,720 |  |  |  | 37,788 |  |  |  | 36,720 | 37,788 | 42,690
Asia/Pacific |  |  |  |  |  |  |  |  |  |  |
Goodwill Impairment Testing |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,396 |  |  | 1,567 | 1,567 |  |  | 1,706 | 1,567 | 1,706 | 1,706
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill at beginning of period, gross |  |  |  | 1,567 |  |  |  | 1,706 | 1,567 | 1,706 |
Accumulated impairment losses, beginning of period |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Goodwill at the beginning of the period, net |  |  |  | $ 1,567 |  |  |  | $ 1,706 | 1,567 | 1,706 |
Goodwill acquired |  |  |  |  |  |  |  |  | 0 |  |
Foreign exchange |  |  |  |  |  |  |  |  | (171) | (139) |
Impairment |  |  |  |  |  |  |  |  |  | 0 |
Reclassifications |  |  |  |  |  |  |  |  |  | 0 |
Goodwill at end of period, gross | 1,396 |  |  |  | 1,567 |  |  |  | 1,396 | 1,567 | 1,706
Accumulated impairment losses, end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Goodwill at the end of the period, net | $ 1,396 |  |  |  | $ 1,567 |  |  |  | $ 1,396 | $ 1,567 | $ 1,706

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