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Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 07, 2017
Jul. 07, 2016
Jun. 10, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jan. 26, 2017
Dec. 31, 2016
Aug. 11, 2016
Jun. 09, 2016
Jan. 07, 2016
Debt                        
Maturity date           Jun. 10, 2023            
Long-term debt, gross       $ 1,409,133,000   $ 1,409,133,000     $ 999,194,000      
Interest expense, debt       $ 10,900,000 $ 3,800,000 $ 20,200,000 $ 7,500,000          
Credit Agreement Amendment                        
Debt                        
Current borrowing capacity     $ 1,100,000,000                  
Maximum borrowing capacity as a percentage of maximum principal amount     10.00%                  
Accordion feature, increase limit     $ 500,000,000                  
Maximum borrowing capacity under accordion feature     $ 1,600,000,000                  
Prepayment of premium percentage, maximum     2.00%                  
Unused fee (as a percent)     0.25%                  
Credit Agreement Amendment | London Interbank Offered Rate (LIBOR)                        
Debt                        
Reference rate (as a percent)     1.20%                  
Series A                        
Debt                        
Interest rate (as a percent)                   4.09%   4.03%
Series B                        
Debt                        
Interest rate (as a percent)                   4.18%   4.43%
Series C                        
Debt                        
Interest rate (as a percent)                       4.57%
Series D                        
Debt                        
Interest rate (as a percent)                       4.74%
Unsecured Debt | Unsecured Term Loan Due June 2023                        
Debt                        
Interest rate (as a percent)       2.87%   2.87%            
Debt instrument, face amount       $ 250,000,000   $ 250,000,000            
Long-term debt, gross       250,000,000   $ 250,000,000     $ 250,000,000      
Unsecured Debt | Unsecured Term Loan Due June 2023 | London Interbank Offered Rate (LIBOR)                        
Debt                        
Reference rate (as a percent)   1.80%       1.80%            
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020                        
Debt                        
Current borrowing capacity       472,900,000   $ 472,900,000            
Amount outstanding       360,000,000.0   360,000,000.0            
Term of extension option     1 year                  
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Credit Agreement Amendment | Minimum                        
Debt                        
Current borrowing capacity                     $ 750,000,000  
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Credit Agreement Amendment | Maximum                        
Debt                        
Current borrowing capacity     $ 850,000,000                  
Term Loan                        
Debt                        
Amount outstanding   $ 250.0   $ 250,000,000.0   $ 250,000,000.0            
Term Loan | Credit Agreement Amendment                        
Debt                        
Current borrowing capacity     $ 250,000,000                  
Debt instrument, term     7 years                  
Senior notes                        
Debt                        
Effective fixed interest rate               4.30%        
Debt instrument, face amount $ 400,000,000.0                 $ 75,000,000.0   $ 150,000,000.0
Redemption price, percentage 99.68%                      
Proceeds from issuance of debt $ 396,100,000                      
Senior notes | Series A                        
Debt                        
Debt instrument, face amount                   25,000,000.0   15,000,000.0
Senior notes | Series B                        
Debt                        
Debt instrument, face amount                   $ 25,000,000.0   45,000,000.0
Senior notes | Series C                        
Debt                        
Interest rate (as a percent)                   4.24%    
Debt instrument, face amount                   $ 25,000,000.0   45,000,000.0
Senior notes | Series D                        
Debt                        
Debt instrument, face amount                       $ 45,000,000.0
Interest Rate Swap                        
Debt                        
Effective fixed interest rate   2.87%                    
Interest Rate Swap | Unsecured Debt | London Interbank Offered Rate (LIBOR)                        
Debt                        
Effective fixed interest rate   1.07%                    
Interest rate (as a percent)   2.87%                    
Operating Partnership | $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020                        
Debt                        
Interest rate at end of period (as a percent)       3.58%   3.58%            
Operating Partnership | $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | London Interbank Offered Rate (LIBOR)                        
Debt                        
Reference rate (as a percent)           1.17%