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Goodwill and Franchise Value (Schedule of Franchise Value) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Indefinite-lived Intangible Assets [Roll Forward]    
Balance $ 184,268 $ 157,699
Additions through acquisitions 495 27,087
Reductions through divestitures   (518)
Balance $ 184,763 $ 184,268