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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%

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