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Derivative Financial Instruments - Additional Information (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 12, 2018
Oct. 31, 2017
Oct. 31, 2015
Debt Instrument [Line Items]          
Gain upon settlement of cash flow hedges, (less than $0.1 million) $ (300,000) $ (100,000)      
2015 Credit Facility          
Debt Instrument [Line Items]          
Amount of hedged item         $ 262,500,000
Maximum borrowing capacity       $ 350,000,000  
2018 Credit Facility          
Debt Instrument [Line Items]          
Notional amount     $ 170,600,000    
2015 Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount         $ 262,500,000
Fixed interest rate         1.46%
2018 Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount     170,600,000    
Amount of hedged item     $ 170,600,000    
Fixed interest rate     2.937%    
Recurring | Designated as Hedging Instrument          
Debt Instrument [Line Items]          
Net derivative asset $ 4,900,000