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Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Apr. 30, 2010
Apr. 01, 2010
Period One | Mortgage Loan On Headquarters Facility | Mortgages      
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk      
Strike rate 5.91% 5.91%  
Period Two | Mortgage Loan On Headquarters Facility | Mortgages      
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk      
Strike rate 6.07% 6.07%  
Interest Rate Swap | First half of mortgage      
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk      
Notional $ 1,299    
Asset (Liability) $ (5)    
Effective Date Apr. 01, 2010    
Maturity Date Apr. 01, 2019    
Index 1-month LIBOR    
Strike rate     5.91%
Interest Rate Swap | Second half of mortgage      
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk      
Notional $ 1,299    
Asset (Liability) $ (6)    
Effective Date Apr. 01, 2010    
Maturity Date Apr. 01, 2019    
Index 1-month LIBOR    
Strike rate     6.07%