Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncement and Recently Issued Accounting Pronouncements Pending Adoption (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	[1]	$ 402,428		$ 0
Operating lease, liability		$ 435,889
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset			$ 334,700
Operating lease, liability			$ 362,700

[1] We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our consolidated financial statements in the year of adoption. Refer to Note 2 for further details.