Fair Value - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Total assets and liabilities measured at fair value	$ 22,700,000	$ 22,900,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes	$ 195,500	$ 179,600
Total assets and liabilities measured at fair value priced using non-binding broker quotes (percentage)	0.90%	0.80%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Senior notes	$ 1,871,869	$ 1,871,626
Estimated fair value of senior notes	$ 2,260,000	$ 2,340,000