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Other Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Commitments and Contingencies [Abstract]      
Rental expense $ 30,000,000 $ 30,000,000 $ 28,000,000
Future minimum rents payable, year 1 23,668,000    
Future minimum rents payable, year 2 17,953,000    
Future minimum rents payable, year 3 11,475,000    
Future minimum rents payable, year 4 7,276,000    
Future minimum rents payable in five years and thereafter $ 18,060,000    
Future minimum license fees payable Future minimum license fees payable under existing license agreements as of December 31, 2013 are immaterial for the years ended December 31, 2014 and thereafter.