Debt (Schedule of Interest Rate Derivatives) (Details)	6 Months Ended
	Jun. 30, 2019 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	3.41%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 80,000,000
Derivative Asset, Fair Value, Gross Asset	$ (208,000)
Interest Rate Swap, Date Entered, March 2014 [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.46%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 130,000,000
Derivative Asset, Fair Value, Gross Asset	$ (398,000)
Interest Rate Swap, Date Entered, March 2019 - 3.46% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.46%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 100,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ 1,436,000
Interest Rate Swap, Date Entered, March 2019 - 3.47% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.47%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 100,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ 1,468,000
Interest Rate Swap, Date Entered, June 2019 - 2.84% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.84%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 150,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ 48,000
Interest Rate Swap, Date Entered, June 2019 - 2.88% [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.88%
Debt Instrument, Description of Variable Rate Basis	1-month LIBOR
Derivative, Notional Amount	$ 50,000,000
Interest Rate Derivative Liabilities, at Fair Value	$ 1,000