Derivative Financial Instruments (Schedule of Cash Flow Hedging Instruments) (Details) - Cash flow hedging - Designated as hedging instrument $ in Thousands	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Notional Amount	$ 3,306,786
Fair Value Asset (Liability)	(31,533)
Interest rate swaps maturing October 2021
Derivative [Line Items]
Notional Amount	25,000
Fair Value Asset (Liability)	(423)
Interest rate swaps maturing November 2021
Derivative [Line Items]
Notional Amount	20,000
Fair Value Asset (Liability)	(397)
Interest rate swaps maturing December 2021
Derivative [Line Items]
Notional Amount	165,000
Fair Value Asset (Liability)	(3,519)
Interest rate swaps maturing March 2022
Derivative [Line Items]
Notional Amount	500,000
Fair Value Asset (Liability)	(294)
Interest rate swaps maturing May 2022
Derivative [Line Items]
Notional Amount	370,000
Fair Value Asset (Liability)	(9,670)
Interest rate swaps maturing June 2022
Derivative [Line Items]
Notional Amount	160,000
Fair Value Asset (Liability)	(4,412)
Interest rate swaps maturing July 2022
Derivative [Line Items]
Notional Amount	230,000
Fair Value Asset (Liability)	(6,452)
Interest rate swaps maturing August 2022
Derivative [Line Items]
Notional Amount	235,000
Fair Value Asset (Liability)	(7,073)
Interest rate swaps maturing March 2023
Derivative [Line Items]
Notional Amount	250,000
Fair Value Asset (Liability)	(698)
Interest rate swaps maturing April 2024
Derivative [Line Items]
Notional Amount	250,000
Fair Value Asset (Liability)	(1,248)
Interest rate swaps maturing July 2027
Derivative [Line Items]
Notional Amount	1,000,000
Fair Value Asset (Liability)	8,182
Interest rate collars maturing September 2023
Derivative [Line Items]
Notional Amount	101,786
Fair Value Asset (Liability)	$ (5,529)