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Significant Accounting Policies (Schedule, Cash, Cash Equivalent, Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance Sheet:        
Cash and cash equivalents $ 30,284 $ 46,156 $ 118,799  
Restricted cash 144,930 136,667 131,442  
Statement of Cash Flows:        
Cash, cash equivalents and restricted cash $ 175,214 $ 182,823 $ 250,241 $ 168,968