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Goodwill and Franchise Value (Schedule of Franchise Value) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Dec. 31, 2017
Indefinite-lived Intangible Assets [Roll Forward]      
Balance $ 186,977   $ 184,268
Additions through acquisitions 0   495
Adjustments to purchase price allocations   $ 2,200 2,214
Balance $ 186,977   $ 186,977