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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Plant and equipment          
Property and equipment $ 1,867,795   $ 1,867,795   $ 1,743,950
Less accumulated depreciation (1,032,333)   (1,032,333)   (974,805)
Property and equipment, net 835,462   835,462   769,145
Increase in property and equipment     66,300    
Depreciation expense 41,800 $ 42,000 84,700 $ 84,000  
Interest capitalized in connection with major construction projects 1,200 $ 100 1,800 $ 200  
Land and Improvements          
Plant and equipment          
Property and equipment 56,702   56,702   42,350
Building and Improvements          
Plant and equipment          
Property and equipment 294,187   294,187   173,043
Furniture, Fixtures and Equipment          
Plant and equipment          
Property and equipment 1,259,639   1,259,639   1,213,143
Leasehold Improvements          
Plant and equipment          
Property and equipment 248,447   248,447   246,047
Construction in Progress          
Plant and equipment          
Property and equipment $ 8,820   $ 8,820   $ 69,367