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Restricted Cash (Schedule of Cash and Cash Equivilents and Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Restricted Cash [Abstract]        
Cash and cash equivalents $ 231,838 $ 184,569    
Restricted cash included in other assets 29,503 29,601    
Total cash, cash equivalents and restricted cash $ 261,341 $ 214,170 $ 150,914 $ 116,370