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Derivatives (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
derivative
Dec. 31, 2017
USD ($)
derivative
Dec. 31, 2016
USD ($)
Mar. 13, 2018
Jan. 01, 2018
USD ($)
Derivative          
Cumulative-effect adjjustment to other comprehensive income   $ 0      
Loss recognized related to ineffective portion of derivative contracts   70,000 $ 1,400,000    
Unrealized gain included in accumulated other comprehensive loss $ 7,900,000        
Accumulated Deficit          
Derivative          
Cumulative-effect adjjustment to other comprehensive income   $ (231,000)      
Accumulated Deficit | ASU 2017-12          
Derivative          
Cumulative-effect adjjustment to other comprehensive income         $ 231,000
Met Park North          
Derivative          
Fixed interest rate percentage 3.71%        
Designated as Hedging Instrument | Interest Rate Swaps          
Derivative          
Number of derivative instruments held | derivative 6 6      
Notional amount $ 839,500,000 $ 839,500,000      
Fair Value 16,687,000 12,321,000      
Designated as Hedging Instrument | Interest Rate Swaps | Met Park North          
Derivative          
Notional amount 64,500,000        
Fair Value $ 350,000 (265,000)      
Designated as Hedging Instrument | Interest Rate Swaps | Met Park North | Minimum          
Derivative          
Fixed interest rate percentage 3.71%        
Designated as Hedging Instrument | Interest Rate Swaps | Met Park North | Maximum          
Derivative          
Fixed interest rate percentage 3.71%        
Designated as Hedging Instrument | Interest Rate Swaps | Term A Loan          
Derivative          
Number of derivative instruments held | derivative 2        
Notional amount $ 300,000,000        
Fair Value $ 4,038,000 3,520,000      
Designated as Hedging Instrument | Interest Rate Swaps | Term A Loan | Minimum          
Derivative          
Fixed interest rate percentage 2.65%     2.75%  
Designated as Hedging Instrument | Interest Rate Swaps | Term A Loan | Maximum          
Derivative          
Fixed interest rate percentage 3.06%     3.65%  
Designated as Hedging Instrument | Interest Rate Swaps | Term B Loan          
Derivative          
Number of derivative instruments held | derivative 2        
Notional amount $ 350,000,000        
Fair Value $ 7,543,000 4,960,000      
Designated as Hedging Instrument | Interest Rate Swaps | Term B Loan | Minimum          
Derivative          
Fixed interest rate percentage 2.96%     3.36%  
Designated as Hedging Instrument | Interest Rate Swaps | Term B Loan | Maximum          
Derivative          
Fixed interest rate percentage 3.46%     4.31%  
Designated as Hedging Instrument | Interest Rate Swaps | Term D Loan          
Derivative          
Number of derivative instruments held | derivative 1        
Notional amount $ 125,000,000        
Fair Value $ 4,756,000 $ 4,106,000      
Designated as Hedging Instrument | Interest Rate Swaps | Term D Loan | Minimum          
Derivative          
Fixed interest rate percentage 2.63%     3.03%  
Designated as Hedging Instrument | Interest Rate Swaps | Term D Loan | Maximum          
Derivative          
Fixed interest rate percentage 3.13%     3.98%