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Other Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Commitments and Contingencies [Abstract]      
Rental expense $ 27,000 $ 28,000 $ 27,000
Future minimum rents payable, year 1 23,168    
Future minimum rents payable, year 2 18,228    
Future minimum rents payable, year 3 14,122    
Future minimum rents payable, year 4 8,652    
Future minimum rents payable in five years and thereafter 25,512    
Total future minimum rents payable $ 89,682    
Future minimum license fees payable Future minimum license fees payable under existing license agreements as of December 31, 2017 are immaterial for the years ended December 31, 2018 and thereafter.    
Potential payments under licensing arrangements $ 7,000