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Operations and Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) location | Dec. 31, 2016 USD ($)
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, gross | $ 148,560 | $ 148,031
Accumulated impairment losses, beginning of period | (24,081) | (24,081)
Goodwill at the beginning of the period, net | 124,479 | 123,950
Goodwill acquired | 10,066 | 1,848
Foreign exchange | 2,784 | (880)
Reclassifications of goodwill | 189 | 439
Goodwill at end of period, gross | 161,221 | 148,560
Accumulated impairment losses, end of period | (24,081) | (24,081)
Goodwill at the end of the period, net | $ 137,140 | 124,479
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 | 4 |
S&P Clever |  |
Goodwill Impairment Testing |  |
Number of locations into which the activities will be consolidated | location | 9 |
Denmark Reporting Unit |  |
Goodwill Impairment Testing |  |
Percentage of fair value in excess of carrying amount | 8.30% |
Goodwill, impairment loss | $ 7,100 |
Increase in Discount Rate | 5.00% |
Decrease in Multiple Rate | 2.10% |
Decrease in CAGR | 1.39% |
Decrease in Average Annual Pre-Tax Operating Profit | 37.00% |
North America |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, gross | $ 96,154 | 96,500
Accumulated impairment losses, beginning of period | (10,666) | (10,666)
Goodwill at the beginning of the period, net | 85,488 | 85,834
Goodwill acquired | 10,066 | 0
Foreign exchange | 198 | 93
Reclassifications of goodwill | (3) | 439
Goodwill at end of period, gross | 106,421 | 96,154
Accumulated impairment losses, end of period | (10,666) | (10,666)
Goodwill at the end of the period, net | 95,755 | 85,488
Europe |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, gross | 51,031 | 50,135
Accumulated impairment losses, beginning of period | (13,415) | (13,415)
Goodwill at the beginning of the period, net | 37,616 | 36,720
Goodwill acquired | 0 | 1,848
Foreign exchange | 2,472 | (952)
Reclassifications of goodwill | 192 | 0
Goodwill at end of period, gross | 53,311 | 51,031
Accumulated impairment losses, end of period | (13,415) | (13,415)
Goodwill at the end of the period, net | 39,896 | 37,616
Asia/Pacific |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, gross | 1,375 | 1,396
Accumulated impairment losses, beginning of period | 0 | 0
Goodwill at the beginning of the period, net | 1,375 | 1,396
Goodwill acquired | 0 | 0
Foreign exchange | 114 | (21)
Reclassifications of goodwill |  | 0
Goodwill at end of period, gross | 1,489 | 1,375
Accumulated impairment losses, end of period | 0 | 0
Goodwill at the end of the period, net | 1,489 | 1,375
Patents |  |
Goodwill [Roll Forward] |  |
Reclassifications |  | 212
Noncompete Agreements Trademarks and Other |  |
Goodwill [Roll Forward] |  |
Reclassifications |  | 119
Customer Relationships |  |
Goodwill [Roll Forward] |  |
Reclassifications | $ (626) | $ 46

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