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Summary of Significant Accounting Policies - Deferred Financing Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Gross deferred financing costs	$ 128,469	$ 113,678
Accumulated amortization of deferred financing costs	41,862	$ 27,438
Deferred Financing Costs, Amortization Expense, Rolling Maturity [Abstract]
2019	15,544
2020	15,396
2021	14,272
2022	13,227
2023	10,108
Thereafter	$ 18,060

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Deferred Financing Costs, Amortization Expense, Next Twelve Months

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Deferred Financing Costs, Amortization Expense, Year Five

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Amount of accumulated amortization of debt issuance costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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