Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 105,903	$ 64,087
Restricted cash	[1]	34,366	44,245
Total cash, cash equivalents, and restricted cash		$ 140,269	$ 108,332	$ 108,962	$ 25,200

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