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Commitments and Contingencies (Minimum Lease Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
2015 $ 40,924    
2016 44,264    
2017 17,218    
2018 15,325    
2019 13,492    
Thereafter 388,213    
Lease obligations 519,436    
Selling, General and Administrative Expenses      
Operating Leased Assets [Line Items]      
Lease expense during the period $ 29,000 $ 29,400 $ 23,800