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Subsequent Events (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 11, 2018
Nov. 06, 2018
Sep. 30, 2018
Sep. 30, 2017
Oct. 22, 2018
Subsequent Event [Line Items]          
Consideration transferred, asset purchase agreement     $ 32,290,000 $ 25,324,000  
Broadcasting | Subsequent Event          
Subsequent Event [Line Items]          
Consideration paid   $ 5,600,000      
Consideration transferred, asset purchase agreement   $ 300,000      
GrayWolf Industrial | DBMG | Subsequent Event          
Subsequent Event [Line Items]          
Consideration paid $ 135,000,000        
Senior Notes Due 2023 | Subsequent Event          
Subsequent Event [Line Items]          
Aggregate principal amount         $ 535,000,000