Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 980,039	$ 127,432
Restricted cash	[1]	21,198	26,182
Total cash, cash equivalents, and restricted cash		$ 1,001,237	$ 153,614	$ 140,269	$ 108,332

[1] (1) Restricted cash balances are included in "prepaid expenses and other assets" on our consolidated balance sheets.