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Derivatives (Details)
12 Months Ended
May 03, 2016
USD ($)
Apr. 01, 2015
USD ($)
derivative
Jul. 31, 2013
USD ($)
Dec. 31, 2017
USD ($)
derivative
Dec. 31, 2016
USD ($)
derivative
Dec. 31, 2015
USD ($)
Jul. 31, 2016
USD ($)
derivative
Jun. 30, 2016
Jun. 01, 2016
May 01, 2015
Derivative                    
Loss recognized related to ineffective portion of derivative contracts       $ 70,000 $ 1,400,000 $ 0        
Notes payable       2,439,311,000            
Derivative assets       12,586,000 5,935,000          
Derivative liabilities       265,000 1,303,000          
Unrealized gain included in accumulated other comprehensive loss       $ 1,500,000   $ 2,597,000        
Met Park North                    
Derivative                    
Debt instrument term     7 years              
Fixed interest rate percentage       371.00%            
Notes payable     $ 64,500,000              
Met Park North | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate     1.55%              
Unsecured Debt                    
Derivative                    
Notes payable       $ 1,975,000,000 2,025,000,000          
Unsecured Debt | 5-Year Term Loan due April 2020                    
Derivative                    
Debt instrument term   5 years                
Notes payable       $ 300,000,000 450,000,000          
Unsecured Debt | 5-Year Term Loan due April 2020 | Minimum                    
Derivative                    
Fixed interest rate percentage             2.75%     2.66%
Unsecured Debt | 5-Year Term Loan due April 2020 | Minimum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate       1.30%            
Unsecured Debt | 5-Year Term Loan due April 2020 | Maximum                    
Derivative                    
Fixed interest rate percentage             3.65%     3.56%
Unsecured Debt | 5-Year Term Loan due April 2020 | Maximum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate       2.20%            
Unsecured Debt | 7 Year Term Loan Facility 2015                    
Derivative                    
Debt instrument term   7 years                
Debt instrument, face amount   $ 350,000,000.0                
Unsecured Debt | 7 Year Term Loan Facility 2015 | Minimum                    
Derivative                    
Fixed interest rate percentage             3.36%     3.21%
Unsecured Debt | 7 Year Term Loan Facility 2015 | Maximum                    
Derivative                    
Fixed interest rate percentage             4.31%     4.16%
Unsecured Debt | 7-Year Term Loan due November 2022                    
Derivative                    
Debt instrument term 7 years                  
Notes payable       $ 125,000,000 $ 125,000,000          
Unsecured Debt | 7-Year Term Loan due November 2022 | Minimum                    
Derivative                    
Fixed interest rate percentage               3.03%    
Unsecured Debt | 7-Year Term Loan due November 2022 | Minimum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate       1.60%            
Unsecured Debt | 7-Year Term Loan due November 2022 | Maximum                    
Derivative                    
Fixed interest rate percentage               3.98%    
Unsecured Debt | 7-Year Term Loan due November 2022 | Maximum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate       2.55%            
Designated as Hedging Instrument | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Derivative, floor interest rate             0.00%      
Interest Rate Caps | Designated as Hedging Instrument                    
Derivative                    
Number of derivative instruments held | derivative       6 6          
Notional amount       $ 839,500,000 $ 83,900,000          
Interest Rate Swaps | 7 Year Term Loan Facility 2015                    
Derivative                    
Fixed interest rate                   1.61%
Interest Rate Swaps | Unsecured Debt | 7 Year Term Loan Facility 2015                    
Derivative                    
Number of derivative instruments held | derivative   2                
Interest Rate Contract                    
Derivative                    
Number of derivative instruments held | derivative   2                
Derivative asset notional amount   $ 300,000,000.0         $ 300,000,000.0      
Interest Rate Contract | 5-Year Term Loan due April 2020                    
Derivative                    
Number of derivative instruments held | derivative             2      
Interest Rate Contract | 7-Year Term Loan due November 2022                    
Derivative                    
Derivative asset notional amount $ 125,000,000.0                  
Fixed interest rate                 1.43%  
Interest Rate Contract | Met Park North | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Interest rate cap     2.16%              
Interest Rate Contract | Not Designated as Hedging Instrument | 5-Year Term Loan due April 2020 | Minimum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate   1.30%                
Interest Rate Contract | Not Designated as Hedging Instrument | 5-Year Term Loan due April 2020 | Maximum | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Basis spread on variable rate   2.20%                
Interest Rate Contract, Instrument A | 5-Year Term Loan due April 2020                    
Derivative                    
Notional amount   $ 150,000,000.0                
Fixed interest rate                   1.36%
Interest Rate Contract, Instrument B | 5-Year Term Loan due April 2020                    
Derivative                    
Notional amount   $ 150,000,000                
Fixed interest rate                   1.36%
Interest Rate Floor | 7-Year Term Loan due November 2022 | London Interbank Offered Rate (LIBOR)                    
Derivative                    
Derivative, floor interest rate 0.00%