| Intangible Assets - Definite Life Intangible Assets (Details) - USD ($) | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | |
| Goodwill and Intangible Assets Disclosure [Abstract] | |||
| Impairment of finite-lived intangible assets | $ 0 | $ 0 | $ 0 | 
| Amortization of intangible assets | 23,185,000 | 37,455,000 | $ 48,545,000 | 
| Retired | |||
| Definite life intangible assets: | |||
| Intangible assets | $ 390,043,000 | $ 0 | |
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- References No definition available. 
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Details 
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