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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases [Abstract]      
Rent expense $ 18,400 $ 18,100 $ 18,100
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 16,330    
2018 14,206    
2019 12,286    
2020 11,040    
2021 9,396    
Thereafter 44,395    
Total $ 107,653