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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Apr. 01, 2010
Debt Instrument, Redemption, Period One [Member] | Mortgage Loan On Headquarters Facility [Member] | Mortgages [Member] |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Strike rate | 5.91% | 5.905% | 5.91%
Debt Instrument, Redemption, Period Two [Member] | Mortgage Loan On Headquarters Facility [Member] | Mortgages [Member] |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Strike rate | 6.07% | 6.07% | 6.07%
Interest Rate Swap [Member] | First half of mortgage [Member] |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Notional | $ 1,322 | $ 1,389 |
Asset (Liability) | $ (9) | $ (33) |
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 |  |  | 5.91%
Interest Rate Swap [Member] | Second half of mortgage [Member] |  |  |
Schedule of interest rate derivatives designated as cash flow hedges of interest rate risk |  |  |
Notional | $ 1,322 | $ 1,389 |
Asset (Liability) | $ (11) | $ (36) |
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 |  |  | 6.07%

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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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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