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Commitments and Contingencies (Minimum Lease Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]      
2015 $ 45,970    
2016 18,517    
2017 16,326    
2018 14,083    
2019 13,665    
Thereafter 322,243    
Lease obligations 430,804    
Selling, General and Administrative Expenses      
Operating Leased Assets [Line Items]      
Lease expense during the period $ 31,000 $ 29,000 $ 29,400