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Recent Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Recent Accounting Standards [Abstract]        
Restricted Cash $ 28,501      
Cash, cash equivalents and restricted cash at end of period 150,914 $ 261,341 $ 214,170 $ 116,370
Increase in net cash provided by operating activities $ 11