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Business and Segment Reporting (Reconcilation of Assets of Segments to Consolidated Amounts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Business and Segment Reporting [Abstract]      
Adjusted total assets $ 1,757,701   $ 1,647,882
Cash and cash equivalents 91,547 $ 60,027 73,390
Restricted cash 32,313 10,579  
Other unallocated amounts 5,145   3,053
Consolidated total assets $ 1,886,706 $ 1,664,484 $ 1,724,325