Debt and Derivative Instruments (Summary of Interest Rate Swap Contracts Outstanding) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Derivative liability, notional amount	$ 348,796
Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (7,469)
Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative instrument, date entered	Feb. 11, 2015
Derivative instrument, effective date	Mar. 02, 2015
Derivative instrument, maturity date	Mar. 01, 2022
Derivative instrument, pay fixed interest rate	2.02%	[1]
Derivative liability, notional amount	$ 6,114
Interest Rate Swap One [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (19)
Interest Rate Swap Two [Member]
Derivative [Line Items]
Derivative instrument, date entered	Apr. 07, 2015
Derivative instrument, effective date	Apr. 07, 2015
Derivative instrument, maturity date	Apr. 07, 2022
Derivative instrument, pay fixed interest rate	1.74%	[1]
Derivative liability, notional amount	$ 47,745
Interest Rate Swap Two [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (203)
Interest Rate Swap Three [Member]
Derivative [Line Items]
Derivative instrument, date entered	Sep. 17, 2015
Derivative instrument, effective date	Sep. 17, 2015
Derivative instrument, maturity date	Sep. 17, 2022
Derivative instrument, pay fixed interest rate	1.90%	[1]
Derivative liability, notional amount	$ 13,700
Interest Rate Swap Three [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (154)
Interest Rate Swap Four [Member]
Derivative [Line Items]
Derivative instrument, date entered	Oct. 02, 2015
Derivative instrument, effective date	Nov. 01, 2015
Derivative instrument, maturity date	Nov. 01, 2022
Derivative instrument, pay fixed interest rate	1.79%	[1]
Derivative liability, notional amount	$ 13,100
Interest Rate Swap Four [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (154)
Interest Rate Swap Five [Member]
Derivative [Line Items]
Derivative instrument, date entered	Dec. 23, 2015
Derivative instrument, effective date	Dec. 23, 2015
Derivative instrument, maturity date	Jan. 02, 2026
Derivative instrument, pay fixed interest rate	2.30%	[1]
Derivative liability, notional amount	$ 26,000
Interest Rate Swap Five [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (1,168)
Interest Rate Swap Six [Member]
Derivative [Line Items]
Derivative instrument, date entered	Jun. 07, 2016
Derivative instrument, effective date	Jul. 01, 2016
Derivative instrument, maturity date	Jul. 01, 2023
Derivative instrument, pay fixed interest rate	1.42%	[1]
Derivative liability, notional amount	$ 41,348
Interest Rate Swap Six [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (475)
Interest Rate Swap Seven [Member]
Derivative [Line Items]
Derivative instrument, date entered	Jul. 21, 2016
Derivative instrument, effective date	Aug. 01, 2016
Derivative instrument, maturity date	Aug. 01, 2023
Derivative instrument, pay fixed interest rate	1.30%	[1]
Derivative liability, notional amount	$ 36,089
Interest Rate Swap Seven [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (347)
Interest Rate Swap Eight [Member]
Derivative [Line Items]
Derivative instrument, date entered	Jun. 05, 2017
Derivative instrument, effective date	May 31, 2017
Derivative instrument, maturity date	May 15, 2022
Derivative instrument, pay fixed interest rate	1.90%	[1]
Derivative liability, notional amount	$ 14,700
Interest Rate Swap Eight [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (94)
Interest Rate Swap Nine [Member]
Derivative [Line Items]
Derivative instrument, date entered	Aug. 23, 2018
Derivative instrument, effective date	Sep. 04, 2018
Derivative instrument, maturity date	Aug. 01, 2023
Derivative instrument, pay fixed interest rate	2.73%	[1]
Derivative liability, notional amount	$ 60,000
Interest Rate Swap Nine [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (1,941)
Interest Rate Swap Ten [Member]
Derivative [Line Items]
Derivative instrument, date entered	Aug. 23, 2018
Derivative instrument, effective date	Sep. 04, 2018
Derivative instrument, maturity date	Aug. 01, 2023
Derivative instrument, pay fixed interest rate	2.74%	[1]
Derivative liability, notional amount	$ 25,000
Interest Rate Swap Ten [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (809)
Interest Rate Swap Eleven [Member]
Derivative [Line Items]
Derivative instrument, date entered	Aug. 23, 2018
Derivative instrument, effective date	Sep. 04, 2018
Derivative instrument, maturity date	Aug. 01, 2023
Derivative instrument, pay fixed interest rate	2.74%	[1]
Derivative liability, notional amount	$ 25,000
Interest Rate Swap Eleven [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (811)
Interest Rate Swap Twelve [Member]
Derivative [Line Items]
Derivative instrument, date entered	Aug. 23, 2018
Derivative instrument, effective date	Sep. 04, 2018
Derivative instrument, maturity date	Aug. 01, 2023
Derivative instrument, pay fixed interest rate	2.73%	[1]
Derivative liability, notional amount	$ 40,000
Interest Rate Swap Twelve [Member] | Recurring [Member]
Derivative [Line Items]
Fair value of derivative liabilities measured on recurring basis	$ (1,294)

[1] Receive floating rate index based upon one month LIBOR. At December 31, 2021, the one-month LIBOR was 0.10%.