v2.4.0.6
Property and Equipment (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Plant and equipment      
Property and equipment $ 4,063,851,000   $ 4,014,770,000
Less accumulated depreciation (1,356,679,000)   (1,283,973,000)
Property and equipment, net 2,707,172,000   2,730,797,000
Depreciation expense 76,200,000 53,200,000  
Interest capitalized in connection with major construction projects 100,000 2,900,000  
Land and improvements
     
Plant and equipment      
Property and equipment 438,378,000   442,882,000
Building and improvements
     
Plant and equipment      
Property and equipment 2,295,878,000   2,283,230,000
Furniture, fixtures and equipment
     
Plant and equipment      
Property and equipment 1,275,140,000   1,240,898,000
Leasehold improvements
     
Plant and equipment      
Property and equipment 17,188,000   17,229,000
Construction in progress
     
Plant and equipment      
Property and equipment $ 37,267,000   $ 30,531,000