Summary Of Significant Accounting Policies Consolidated Statement of Cash Flows - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 43,003	$ 64,087
Restricted cash	[1]	39,209	44,245
Total cash, cash equivalents, and restricted cash		$ 82,212	$ 108,332	$ 73,700	$ 25,200

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