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Derivatives and Hedging Activities (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 19, 2018
Apr. 21, 2017
Apr. 09, 2015
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Dec. 31, 2017
Derivative instruments and hedging activities disclosures              
Amount of gain (loss) recorded in accumulated other comprehensive income       $ 609,000 $ 313,000    
Cash Flow Hedging              
Derivative instruments and hedging activities disclosures              
Earnings related to derivatives due to hedge ineffectiveness       0 0    
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging              
Derivative instruments and hedging activities disclosures              
Amount of swap agreement   $ 100,000,000 $ 75,000,000 $ 50,000,000     $ 50,000,000
Term of loan facility   5 years 5 years        
Derivative, Fixed Interest Rate     2.93% 2.98%     2.98%
Interest rate swap terminated   $ 50,000,000          
Amount of gain (loss) recorded in accumulated other comprehensive income       $ (600,000) 300,000    
Amount reclassified to interest expense       (100,000) $ 300,000    
Derivative asset recognized in other assets       $ 1,700,000     $ 1,100,000
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Subsequent Event              
Derivative instruments and hedging activities disclosures              
Amount of swap agreement $ 75,000,000            
Term of loan facility 5 years            
Derivative, Fixed Interest Rate 4.11%            
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           $ 700,000  
LIBOR | Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging              
Derivative instruments and hedging activities disclosures              
Reference rate     one-month LIBOR        
LIBOR | Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedging | Subsequent Event              
Derivative instruments and hedging activities disclosures              
Reference rate one-month LIBOR