Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) - Cash Flow Hedging - Designated as Hedging Instrument	Jun. 30, 2019 USD ($)
July 2019
Derivative [Line Items]
Notional Amount	$ 250,000,000
Fair Value Asset (Liability)	0
August 2019
Derivative [Line Items]
Notional Amount	275,000,000
Fair Value Asset (Liability)	616,000
October 2021
Derivative [Line Items]
Notional Amount	25,000,000
Fair Value Asset (Liability)	(354,000)
November 2021
Derivative [Line Items]
Notional Amount	20,000,000
Fair Value Asset (Liability)	(298,000)
December 2021
Derivative [Line Items]
Notional Amount	165,000,000
Fair Value Asset (Liability)	(2,540,000)
May 2022
Derivative [Line Items]
Notional Amount	370,000,000
Fair Value Asset (Liability)	(5,123,000)
June 2022
Derivative [Line Items]
Notional Amount	160,000,000
Fair Value Asset (Liability)	(2,073,000)
July 2022
Derivative [Line Items]
Notional Amount	230,000,000
Fair Value Asset (Liability)	(2,964,000)
August 2022
Derivative [Line Items]
Notional Amount	235,000,000
Fair Value Asset (Liability)	(3,124,000)
September 2023
Derivative [Line Items]
Notional Amount	133,929,000
Fair Value Asset (Liability)	(4,375,000)
Total Cash Flow Hedges
Derivative [Line Items]
Notional Amount	1,863,929,000
Fair Value Asset (Liability)	$ (20,235,000)