Debt Debt Items 2 (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Excluding Impact [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 2,924,784
Debt, Percentage Interest Rate Remaining Term	3 years 4 months 24 days
Excluding Impact [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt, Percentage Interest Rate Remaining Term	3 years 3 months 18 days
Including Impact [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 6,789,089
Debt, Weighted Average Interest Rate	3.78%
Including Impact [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.47%
Including Impact [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 3,864,305
Debt, Weighted Average Interest Rate	4.25%
Designated as Hedging Instrument [Member] | Including Impact [Member] | Fixed and Hedged Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 5,651,148
Debt, Weighted Average Interest Rate	4.04%
Designated as Hedging Instrument [Member] | Including Impact [Member] | Hedged Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.59%
Not Designated as Hedging Instrument [Member] | Including Impact [Member] | Unhedged Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 1,137,941
Line of Credit and Second Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 515,800