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Debt (Credit Agreement) (Details)
AUD in Millions
12 Months Ended
Aug. 27, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
AUD
Aug. 27, 2014
AUD
Debt Instrument [Line Items]            
Capitalized loan costs   $ 57,500,000 $ 53,900,000      
Term Loans   292,500,000 295,500,000      
Line of Credit, amount outstanding   485,000,000 $ 70,000,000      
Outstanding balance   2,139,391,000        
Additional increase in borrowing capacity ability   350,000,000        
Weighted average interest rates on outstanding borrowings     3.10%   3.10%  
Loss on extinguishment of debt   0 $ 0 $ 20,657,000    
Term Loan            
Debt Instrument [Line Items]            
Term Loans   292,500,000        
Letter of credit            
Debt Instrument [Line Items]            
Outstanding balance   54,300,000        
Additional Revolver            
Debt Instrument [Line Items]            
Borrowing capacity remaining   160,700,000        
Australian LC Facility | Letter of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity | AUD           AUD 225.0
Outstanding balance | AUD         AUD 215.0  
Revolver            
Debt Instrument [Line Items]            
Line of Credit, amount outstanding   $ 485,000,000        
Revolver | LIBOR            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate 2.25%          
Revolver | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 700,000,000          
Term Loan | LIBOR            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate 2.50%          
Term Loan | LIBOR | Minimum            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate 0.75%          
Credit Facility            
Debt Instrument [Line Items]            
Write off amount of deferred financing fees $ 400,000          
Capitalized loan costs $ 4,600,000          
Credit Agreement            
Debt Instrument [Line Items]            
Total leverage ratio 5.75         5.75
Senior secured leverage ratio 3.50         3.50
Interest coverage ratio 3.00         3.00
Credit Facility Term Loan | Term Loan            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 296,300,000