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Significant Accounting Policies (Summary Of The Reconciliation Of Cash And Cash Equivalents And Restricted Cash) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Significant Accounting Policies [Abstract]    
Cash and cash equivalents at beginning of period $ 35,710 $ 14,208
Restricted cash at beginning of period 7,090 4,270
Cash and cash equivalents and restricted cash at beginning of period 42,800 18,478
Cash and cash equivalents at end of period 27,701 4,481
Restricted cash at end of period 5,510 4,568
Cash and cash equivalents and restricted cash at end of period 33,211 9,049
Net decrease in cash and cash equivalents and restricted cash $ (9,589) $ (9,429)