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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) | Jan. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Leases, right-of-use asset | $ 406,900,000 |  |
Right-of-use asset | 18,948,000 | $ 35,322,000 | $ 18,900,000
Lease liabilities | 419,500,000 | 338,697 |
Lease liabilities | 20,600,000 | 38,161 |
Lease exit costs accrual |  | 0 | 4,634,000
Intangible assets | 65,700,000 | 64,300,000 | 69,705,000
Right-of-use asset | 387,970,000 | $ 328,850,000 | 0
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Impairment loss | 10,500,000 |  |
Intangible assets | $ (4,005,000) |  | $ (4,000,000.0)

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