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Goodwill and Intangible Assets - Textual (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) reportable_segment | Sep. 30, 2016 USD ($) reportable_segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill, impaired, accumulated impairment loss | $ 95,407,000 |  | $ 95,407,000 |  |
Goodwill, Impairment Loss |  |  | $ 764,000 |  | $ 15,564
Goodwill, Purchase Accounting Adjustments |  |  |  | $ (2,428,000) |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 7 years |  |
Amortization of intangibles |  |  | $ 24,153,000 | 33,352,000 | 30,710,000
Goodwill, Impairment Loss |  |  | 48,524,000 | 0 | 0
Indefinite-lived Intangible Assets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Amortization of intangibles |  |  | $ 21,726,000 | 30,024,000 | $ 29,749,000
Customer Relationships |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 6 years |  |
Other Intangible Assets |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 8 years |  |
All Other [Domain] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 764,000 |  |
Goodwill, Purchase Accounting Adjustments |  |  |  | $ (684,000) |
Goodwill, Impairment Loss |  |  | $ 29,631,000 |  |
Experiential [Member] | All Other [Domain] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting Units, Goodwill Impairment Test Performed During Interim Period | reportable_segment |  | 1 |  |  |
Goodwill, Impairment Loss |  | $ 28,000 |  |  |
Immaterial [Member] | All Other [Domain] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting Units, Goodwill Impairment Test Performed During Interim Period | reportable_segment |  | 1 |  |  |
Goodwill, Impairment Loss |  | $ 2,000 |  |  |
Strategic Communications [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 18,893 |  |  |  |
Strategic Communications [Member] | All Other [Domain] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Reporting Units Impaired, Annual Goodwill Impairment Test | reportable_segment | 1 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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