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Accrued and Other Liabilities - Textual (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities and Other Liabilities [Abstract]        
Outstanding Checks $ 41,989,000 $ 80,193,000    
Accrued media cost, current 207,482,000 201,872,000    
Trust Liability, Current 4,632,000 5,341,000    
Accrued and Other Liabilities Attributable To Noncontrolling Interest $ 11,030,000 $ 4,154,000 $ 5,473,000 $ 6,014,000