Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details)

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Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Total $ 6,619 $ 12,028  
Trade names   160,795  
Intangible asset impairment charge $ 0 6,873 $ 0
Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   153,922  
Estimate of Fair Value Measurement | Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   153,922  
Total   153,922  
Estimate of Fair Value Measurement | Nonrecurring | Quoted Prices in Active Markets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   0  
Total   0  
Estimate of Fair Value Measurement | Nonrecurring | Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   0  
Total   0  
Estimate of Fair Value Measurement | Nonrecurring | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   153,922  
Total   153,922  
Change Measurement During Period | Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Indefinite life tradenames   (6,873)  
Total   $ (6,873)