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Rental Expense and Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Rental Expense and Lease Commitments      
Rent expense $ 23,700 $ 22,600 $ 22,500
Future minimum rental commitments under non-cancelable operating leases      
2016 22,564    
2017 18,042    
2018 13,622    
2019 8,971    
2020 4,606    
Thereafter 12,195    
Total $ 80,000