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Other Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Commitments and Contingencies [Abstract]      
Rental expense $ 27,000 $ 30,000 $ 30,000
Future minimum rents payable, year 1 21,173    
Future minimum rents payable, year 2 15,437    
Future minimum rents payable, year 3 9,135    
Future minimum rents payable, year 4 6,292    
Future minimum rents payable in five years and thereafter $ 15,122    
Future minimum license fees payable Future minimum license fees payable under existing license agreements as of December 31, 2015 are immaterial for the years ended December 31, 2016 and thereafter.    
Potential payments under licensing arrangements $ 12,000