Derivative Financial Instruments (Schedule of Cash Flow Hedging Instruments) (Details) - Cash flow hedging - Designated as hedging instrument $ in Thousands	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Notional Amount	$ 1,328,214
Fair Value Asset (Liability)	(19,385)
Interest rate swaps maturing October 2021
Derivative [Line Items]
Notional Amount	25,000
Fair Value Asset (Liability)	(311)
Interest rate swaps maturing November 2021
Derivative [Line Items]
Notional Amount	20,000
Fair Value Asset (Liability)	(272)
Interest rate swaps maturing December 2021
Derivative [Line Items]
Notional Amount	165,000
Fair Value Asset (Liability)	(2,293)
Interest rate swaps maturing May 2022
Derivative [Line Items]
Notional Amount	370,000
Fair Value Asset (Liability)	(4,880)
Interest rate swaps maturing June 2022
Derivative [Line Items]
Notional Amount	160,000
Fair Value Asset (Liability)	(1,997)
Interest rate swaps maturing July 2022
Derivative [Line Items]
Notional Amount	230,000
Fair Value Asset (Liability)	(2,861)
Interest rate swaps maturing August 2022
Derivative [Line Items]
Notional Amount	235,000
Fair Value Asset (Liability)	(2,923)
Interest rate collars maturing September 2023
Derivative [Line Items]
Notional Amount	123,214
Fair Value Asset (Liability)	$ (3,848)