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Derivatives (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
instrument
derivative
Mar. 31, 2017
USD ($)
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 $ 21,922,000       12,586,000  
Derivative liabilities 0       265,000  
Change in fair value of derivative instruments 4,600,000          
Level 2            
Derivative            
Derivative assets 21,922,000       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%
Term Loan D | Minimum            
Derivative            
Adjusted interest rate     3.03%      
Term Loan D | Maximum            
Derivative            
Adjusted interest rate     3.98%      
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   $ 6,000        
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          
Strike Rate Range 2.16%          
Fair Value $ 322,000          
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 $ 5,313,000          
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 $ 10,143,000          
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 $ 6,144,000          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan D | Minimum            
Derivative            
Adjusted interest rate 2.63%          
Designated as Hedging Instrument | Interest Rate Swap | Term Loan D | Maximum            
Derivative            
Adjusted interest rate 3.13%