Summary of Significant Accounting Policies - Right of Use Asset and Lease Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
2020	$ 489,420
2021	466,210
Total	3,131,068
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Right-of-use asset	2,149
Lease expense	1,670
Lease expense		$ 1,707	$ 374
2020	2,049
2021	175
Total	2,224
Present value of lease liabilities	(45)
Operating lease, liability	$ 2,179