Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect change in accounting principle	$ 1,052,230	$ 698,725	$ 917,597	$ 1,018,413
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect change in accounting principle	$ (3,023,688)	(3,393,088)	$ (3,167,752)	(3,069,272)
Accumulated Deficit | Cumulative Effect Period Of Adoption Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect change in accounting principle		$ (115)		$ (55,885)