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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2010
Debt Instrument, Redemption, Period One | Mortgage Loan On Headquarters Facility | Mortgage loan |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Strike rate |  | 5.91% | 5.91%
Debt Instrument, Redemption, Period Two | Mortgage Loan On Headquarters Facility | Mortgage loan |  |  |
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 | $ 1,275 | $ 1,299 |
Asset (Liability) | $ (1) | $ (5) |
Effective Date | Apr. 01, 2010 | Apr. 01, 2010 |
Maturity Date | Apr. 01, 2019 | Apr. 01, 2019 |
Derivative, Type of Interest Rate Paid on Swap | 1-month LIBOR | 1-month LIBOR |
Strike rate | 5.90% |  |
Interest rate swap | Second half of mortgage |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Notional | $ 1,275 | $ 1,299 |
Asset (Liability) | $ (2) | $ (6) |
Effective Date | Apr. 01, 2010 | Apr. 01, 2010 |
Maturity Date | Apr. 01, 2019 | Apr. 01, 2019 |
Derivative, Type of Interest Rate Paid on Swap | 1-month LIBOR | 1-month LIBOR |
Strike rate | 6.10% |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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