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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Rent Expense, Net $ 66,161 $ 63,940 $ 60,129
Future minimum lease payments [Abstract]      
2018 55,874    
2019 49,540    
2020 42,524    
2021 30,756    
2022 21,612    
Thereafter $ 21,423