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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Rent Expense, Net $ 63,940 $ 60,129 $ 60,214
Future minimum lease payments [Abstract]      
2017 47,324    
2018 39,908    
2019 33,088    
2020 26,211    
2021 15,955    
Thereafter $ 19,890