Cash and Cash Equivalents - Narrative (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Total cash and cash equivalents	$ 1,771,254,000	$ 1,228,371,000
Cash Reserve Deposit Required and Made	0
Total restricted cash balance	$ 103,900,000	$ 68,600,000