Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, liability	$ 478,094
Operating lease, right-of-use asset	443,522	$ 3,200	$ 526,281
Retained earnings	518,335			$ 4,235,491
Property and equipment, net	(1,484,808)			(1,770,516)
Financing obligations	$ 0			$ (320,518)
Accrued Expenses and Other Long-term Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, liability			562,100
Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			35,100
Retained earnings, tax			9,600
Property and equipment, net			266,000
Financing obligations			$ 324,800