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Derivatives (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
instrument
derivative
Jun. 30, 2017
USD ($)
Mar. 12, 2018
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
derivative
Oct. 02, 2017
Derivative              
Adjustment to due to change in accounting principal           $ 0  
Derivative assets   $ 25,485,000       12,586,000  
Derivative liabilities   0       265,000  
Change in fair value of derivative instruments   6,700,000          
Level 2              
Derivative              
Derivative assets   25,485,000       12,586,000  
Derivative liabilities   $ 0       265,000  
Retained Earnings (Accumulated Deficit)              
Derivative              
Adjustment to due to change in accounting principal           $ (231,000)  
Retained Earnings (Accumulated Deficit) | ASU 2017-12              
Derivative              
Adjustment to due to change in accounting principal         $ (231,000)    
Met Park North              
Derivative              
Adjusted interest rate             3.71%
Interest Rate Contract | Term Loan A              
Derivative              
Number of derivative instruments held | derivative   2          
Interest Rate Contract | 7 Year Term Loan Facility 2015              
Derivative              
Unrealized gain (loss) on derivative, ineffective portion $ (51,000)   $ (45,000)        
Designated as Hedging Instrument | Interest Rate Swap              
Derivative              
Number of derivative instruments held | derivative   6       6  
Notional amount of interest rate cash flow hedge derivatives   $ 839,500,000       $ 839,500,000  
Designated as Hedging Instrument | Interest Rate Swap | Met Park North              
Derivative              
Number of derivative instruments held | instrument   1          
Notional amount of interest rate cash flow hedge derivatives   $ 64,500,000          
Fair Value   $ 586,000          
Designated as Hedging Instrument | Interest Rate Swap | Met Park North | Minimum              
Derivative              
Strike Rate Range   2.16%          
Designated as Hedging Instrument | Interest Rate Swap | Met Park North | Maximum              
Derivative              
Strike Rate Range   2.16%          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan A              
Derivative              
Number of derivative instruments held | instrument   2          
Notional amount of interest rate cash flow hedge derivatives   $ 300,000,000          
Fair Value   $ 5,818,000          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan A | Minimum              
Derivative              
Adjusted interest rate   2.56%   2.75%      
Designated as Hedging Instrument | Interest Rate Swap | Term Loan A | Maximum              
Derivative              
Adjusted interest rate   3.06%   3.65%      
Designated as Hedging Instrument | Interest Rate Swap | Term Loan B              
Derivative              
Number of derivative instruments held | instrument   2          
Notional amount of interest rate cash flow hedge derivatives   $ 350,000,000          
Fair Value   $ 12,211,000          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan B | Minimum              
Derivative              
Adjusted interest rate   2.96%   3.36%      
Designated as Hedging Instrument | Interest Rate Swap | Term Loan B | Maximum              
Derivative              
Adjusted interest rate   3.46%   4.31%      
Designated as Hedging Instrument | Interest Rate Swap | Term Loan D              
Derivative              
Number of derivative instruments held | instrument   1          
Notional amount of interest rate cash flow hedge derivatives   $ 125,000,000          
Fair Value   $ 6,870,000          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan D | Minimum              
Derivative              
Adjusted interest rate   2.63%   3.03%      
Designated as Hedging Instrument | Interest Rate Swap | Term Loan D | Maximum              
Derivative              
Adjusted interest rate   3.13%   3.98%