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Lease Obligations - Rent Expense and Future Minimum Rentals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Lease Obligations      
Net rental expense $ 169,000 $ 218,000 $ 206,000
Obligations for minimum rentals under non-cancelable operating leases      
2016 64,300    
2017 51,100    
2018 35,700    
2019 28,900    
2020 24,600    
Thereafter $ 75,600