XML 58 R46.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt - Revolving Credit Agreement (Details)
Apr. 28, 2017
USD ($)
Apr. 27, 2017
USD ($)
Jun. 30, 2017
USD ($)
May 22, 2017
USD ($)
May 21, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Outstanding borrowing     $ 0     $ 0
Revolving Credit Agreement            
Debt Instrument [Line Items]            
Current borrowing base     1,400,000,000      
Borrowing base     1,000,000,000      
Outstanding borrowing     0      
Letters of credit outstanding, amount     2,700,000      
Revolving credit agreement, remaining borrowing capacity     $ 997,300,000      
Revolving Credit Agreement | Weighted Average            
Debt Instrument [Line Items]            
Revolving credit agreement, weighted average interest rate     2.00%      
Third Amendment [Member] | Revolving Credit Agreement            
Debt Instrument [Line Items]            
Debt Instrument, Minimum Mortgage And Title Coverage Requirement 85.00% 90.00%        
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio Threshold 3.50          
Line Of Credit Facility, Aggregate Elected Borrowing Capacity $ 1,000,000,000 $ 600,000,000        
Current borrowing base $ 1,400,000,000 $ 875,000,000        
Fourth Amendment to Terms of the Revolving Credit Agreement [Member] | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Borrowing base       $ 30,000,000.0 $ 10,000,000.0  
Debt Instrument, Restrictive Covenants, Ceiling on Lease Payments, Percent       2.50% 1.50%  
London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate Loans [Member] | Line of Credit [Member] | Revolving Credit Agreement            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 0.50%