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Quarterly Results of Operations - Textual (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Earnings Per Share, Diluted, Pro Forma Adjustment | $ 0.14 |  |  |  |  |
Foreign exchange loss | $ (10,081) |  | $ (9,531) | $ 213,000 | $ 39,328,000 | $ 18,482,000
Cost of services sold | 5,560 |  | 4,771 | 21,003,000 | 17,796,000 | 17,696,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  | 8,227,000 | 38,887,000 | 18,652,000
Goodwill, Impairment Loss |  |  |  | 48,524,000 | 0 | 0
Contingent Payment [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (9,211) |  | $ 41,913 | 7,972,000 | $ 36,344,000 | $ 16,467,000
All Other [Domain] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 29,631,000 |  |
Strategic Communications [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss | $ 18,893 |  |  |  |  |
Experiential and Non-material [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 30,000 |  |  |  |

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