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Derivative Financial Instruments - Additional Information (Details)
3 Months Ended 12 Months Ended
Feb. 20, 2015
USD ($)
Mar. 31, 2016
USD ($)
swap
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Nov. 28, 2017
USD ($)
Sep. 18, 2017
USD ($)
Jun. 23, 2017
USD ($)
Feb. 07, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 17, 2016
USD ($)
Feb. 25, 2016
USD ($)
Oct. 26, 2015
USD ($)
Jul. 13, 2015
USD ($)
Derivatives                          
Interest rate agreement, notional amount     $ 401,079,000           $ 326,901,000        
Senior Unsecured Term Loan Facility                          
Derivatives                          
Aggregate capacity under the credit facility $ 50,000,000.0                        
Senior Unsecured Term Loan Facility | Operating Partnership                          
Derivatives                          
Aggregate capacity under the credit facility $ 125,000,000.0                        
Interest rate swaps                          
Derivatives                          
Interest rate agreement, notional amount     56,079,000           56,901,000        
Number of interest rate swaps hedge relationship terminated (swap) | swap   2                      
Amount of AOCI recognized into earnings   $ 700,000                      
Amount previously allocated to noncontrolling interest recognized in earnings   $ 400,000                      
Overstated net income       $ 1,000,000                  
Interest rate caps                          
Derivatives                          
Interest rate agreement, notional amount     $ 345,000,000   $ 50,000,000.0 $ 50,000,000.0 $ 50,000,000.0 $ 50,000,000 $ 270,000,000        
Interest rate cap agreement, strike price         1.50% 1.50% 1.50% 1.50%          
Interest rate cap agreement, premium (less than)         $ 400,000 $ 200,000 $ 200,000 $ 200,000          
One Month Libor | Senior Unsecured Term Loan Facility | Minimum                          
Derivatives                          
Stated interest rate, basis spread on variable rate 1.35%                        
One Month Libor | Senior Unsecured Term Loan Facility | Maximum                          
Derivatives                          
Stated interest rate, basis spread on variable rate 1.95%                        
One Month Libor | Interest rate swaps                          
Derivatives                          
Interest rate agreement, notional amount $ 50,000,000.0                       $ 6,500,000.0
Fixed rate interest rate swap 2.00%                       3.05%
LIBOR | Senior Unsecured Term Loan Facility | Minimum                          
Derivatives                          
Stated interest rate, basis spread on variable rate     1.35%                    
LIBOR | Senior Unsecured Term Loan Facility | Maximum                          
Derivatives                          
Stated interest rate, basis spread on variable rate     1.95%                    
LIBOR | Interest rate caps                          
Derivatives                          
Interest rate agreement, notional amount                       $ 75,000,000.0  
Interest rate cap agreement, strike price                       1.25%  
Interest rate cap agreement, premium (less than)                       $ 100,000  
LIBOR | Interest rate caps | Operating Partnership                          
Derivatives                          
Interest rate agreement, notional amount                   $ 70,000,000.0 $ 75,000,000.0    
Interest rate cap agreement, strike price                   1.00% 1.50%    
LIBOR | Interest rate caps | Maximum | Operating Partnership                          
Derivatives                          
Interest rate cap agreement, premium (less than)                   $ 100,000 $ 100,000