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Fair Value Measurements - Schedule of Changes to Deferred Acquisition Consideration (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $ 82,598,000 | $ 119,086,000 | $ 82,598,000 | $ 119,086,000 | $ 224,754,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance of contingent payments |  |  | 122,426,000 |  |
Other |  |  | 374,000 | 4,819,000 | $ (8,227,000)
Ending balance of contingent payments | 83,695,000 | 122,426,000 | 83,695,000 | 122,426,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  | (54,947,000) | (110,234,000) |
Additions - acquisition and step-up transactions |  |  | 14,943,000 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  | 3,512,000 | 3,273,000 |
Foreign translation adjustment |  |  | 4,000 | 1,293,000 |
Fixed payments [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance of contingent payments |  |  | 3,340,000 |  |
Ending balance of contingent payments | 1,097,000 | 3,340,000 | 1,097,000 | 3,340,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  | 6,000 |  |
Contingent Payment [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Other | $ (8,979,000) | $ (18,173,000) | $ 3,679,000 | $ 6,021,000 |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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