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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 868,483 |  | $ 868,483 |  | $ 870,301 | $ 851,372
Goodwill, Acquired During Period |  |  | 24,778 |  | 43,655 |
Goodwill, Written off Related to Sale of Business Unit | (764) |  | 764 |  |  |
Goodwill, Impairment Loss | (29,631) | $ 0 | (29,631) | $ 0 |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | (2,428) |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | 3,799 |  | (22,298) |
Reportable Segment [Domain] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 680,168 |  | 680,168 |  | 655,039 | 660,792
Goodwill, Acquired During Period |  |  | 24,778 |  | 6,254 |
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |  |  |
Goodwill, Impairment Loss | 0 |  | 0 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | (1,744) |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | 351 |  | (10,263) |
All Other Segment [Domain] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 188,315 |  | 188,315 |  | 215,262 | $ 190,580
Goodwill, Acquired During Period |  |  | 0 |  | 37,401 |
Goodwill, Written off Related to Sale of Business Unit |  |  | (764) |  |  |
Goodwill, Impairment Loss | $ (29,631) |  | (29,631) |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | (684) |
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | $ 3,448 |  | $ (12,035) |

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