Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 56,116	$ 15,188
Restricted cash	[1]	52,846	10,012
Total cash, cash equivalents, and restricted cash		$ 108,962	$ 25,200	$ 107,918	$ 34,849

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