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Derivatives and Hedging Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 19, 2018
Apr. 21, 2017
Apr. 09, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2019
Mar. 31, 2018
Dec. 31, 2017
Derivative instruments and hedging activities disclosures                    
Amount of gain (loss) recorded in accumulated other comprehensive income       $ 523 $ 41 $ 1,356 $ 31      
Interest expense       $ 9,433 6,447 $ 26,078 17,512      
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging                    
Derivative instruments and hedging activities disclosures                    
Amount of swap agreement $ 75,000 $ 100,000 $ 75,000           $ 50,000 $ 50,000
Term of loan facility 5 years 5 years 5 years              
Derivative, Fixed Interest Rate 4.12%     2.88%   2.88%       2.98%
Interest rate swap terminated   $ 50,000                
Amount of gain (loss) recorded in accumulated other comprehensive income       $ 500 100 $ 1,400 100      
Amount reclassified to interest expense       (100) 100 (100) 600      
Interest expense       9,400 $ 6,400 26,100 $ 17,500      
Derivative asset recognized in other assets       $ 2,300   $ 2,300       $ 1,100
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Forecast                    
Derivative instruments and hedging activities disclosures                    
Amount estimated to be reclassified as an increase to interest expense               $ 900    
LIBOR | Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging                    
Derivative instruments and hedging activities disclosures                    
Reference rate one-month LIBOR   one-month LIBOR              
Derivative, Fixed Interest Rate       2.83%   2.83%       2.93%