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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
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	$ 1,299
Asset (Liability)	$ (6)
Effective Date	Apr. 01, 2010
Maturity Date	Apr. 01, 2019
Strike Rate			6.10%