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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |  |
Beginning Balance | $ 870,301,000 | $ 851,373,000 |
Acquired goodwill | 24,778,000 | 43,654,000 |
Goodwill, Impairment Loss | (764,000) |  | $ (15,564)
Goodwill, Purchase Accounting Adjustments |  | (2,428,000) |
Goodwill, Impairment Loss | (48,524,000) | 0 | 0
Goodwill, Transfers | 0 |  |
Foreign currency translation | (1,032,000) | (22,298,000) |
Ending Balance | 844,759,000 | 870,301,000 | 851,373,000
Reportable Segment [Domain] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance | 142,286,000 | 136,033,000 |
Acquired goodwill | 0 | 6,253,000 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Purchase Accounting Adjustments |  | 0 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Transfers | 34,400,000 |  |
Foreign currency translation | 0 | 0 |
Ending Balance | 176,686,000 | 142,286,000 | 136,033,000
All Other [Domain] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance | 229,607,000 | 209,632,000 |
Acquired goodwill | 0 | 37,401,000 |
Goodwill, Impairment Loss | (764,000) |  |
Goodwill, Purchase Accounting Adjustments |  | (684,000) |
Goodwill, Impairment Loss | (29,631,000) |  |
Goodwill, Transfers | 0 |  |
Foreign currency translation | 2,692,000 | (16,742,000) |
Ending Balance | 201,904,000 | 229,607,000 | 209,632,000
Global Integrated Agencies [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance | 364,159,000 | 370,094,000 |
Acquired goodwill | 24,778,000 | 0 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Purchase Accounting Adjustments |  | (998,000) |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Transfers | (34,400,000) |  |
Foreign currency translation | (3,821,000) | (4,937,000) |
Ending Balance | 350,716,000 | 364,159,000 | 370,094,000
Domestic Creative Agencies [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance | 36,671,000 | 37,117,000 |
Acquired goodwill | 0 | 0 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Purchase Accounting Adjustments |  | 133,000 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Transfers | 0 |  |
Foreign currency translation | 91,000 | (579,000) |
Ending Balance | 36,762,000 | 36,671,000 | 37,117,000
Specialist Communications [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning Balance | 97,578,000 | 98,497,000 |
Acquired goodwill | 0 | 0 |
Goodwill, Impairment Loss | 0 |  |
Goodwill, Purchase Accounting Adjustments |  | (879,000) |
Goodwill, Impairment Loss | (18,893,000) |  |
Goodwill, Transfers | 0 |  |
Foreign currency translation | 6,000 | (40,000) |
Ending Balance | $ 78,691,000 | $ 97,578,000 | $ 98,497,000

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