Debt (Schedule of Interest Rate Derivatives) (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)
Derivative [Line Items]
Derivative, Notional Amount	$ 610,000,000
Interest Rate Swap, Date Entered, June 2013 [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.46%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 80,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (280,000)
Interest Rate Swap, Date Entered, March 2014 [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.51%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 130,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (464,000)
Interest Rate Swap, Date Entered, March 2019 - 3.46% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.51%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 100,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (3,380,000)
Interest Rate Swap, Date Entered, March 2019 - 3.47% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.52%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 100,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (3,403,000)
Interest Rate Swap, Date Entered, June 2019 - 2.84% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.89%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 150,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (3,447,000)
Interest Rate Swap, Date Entered, June 2019 - 2.88% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.93%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 50,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ (1,160,000)