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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fixed interest rate related to the interest rate derivative.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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Nominal or face amount used to calculate payment on derivative.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Expected increase/(decrease) to interest expense			$ 500
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities [Abstract]
Interest rate swaps			846	$ 154
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives (effective portion) [Abstract]
Interest rate swaps/Unrealized gain/(loss) reclassified to interest expense			(1,238)	(9,134)	$ 4,161
Amount of (gains)/losses reclassified out of accumulated other comprehensive income/(loss) into interest expense (effective portion) [Abstract]
Interest rate swaps			$ 247	(1,250)	(2,086)
3.050% (3.079% effective rate) Notes due 2030 [Member]
Derivatives, Fair Value [Line Items]
Principal amount of debt				$ 400,000
Stated interest rate (in hundredths)				3.05%
4.20% (4.234% effective rate) Notes due 2029 [Member]
Derivatives, Fair Value [Line Items]
Principal amount of debt				$ 350,000
Stated interest rate (in hundredths)				4.20%
4.125% (4.271% effective rate) Notes due 2028 [Member]
Derivatives, Fair Value [Line Items]
Principal amount of debt					$ 350,000
Stated interest rate (in hundredths)					4.125%
Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Amount of borrowings outstanding, subject to swaps				$ 150,000	$ 225,000	$ 150,000
Underlying treasury rate term (in years)				10 years	10 years	10 years
Weighted average interest rate under derivative instruments (in hundredths)				1.87%	2.86%	2.44%
Gain on hedge ineffectiveness in interest expense					$ 200
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives (effective portion) [Abstract]
Interest rate swaps/Unrealized gain/(loss) reclassified to interest expense	$ (6,600)	$ (5,100)			$ 7,000
Floating to Fixed Interest Rate Swaps (2017) [Member]
Derivatives, Fair Value [Line Items]
Amount of borrowings outstanding, subject to swaps						$ 50,000
Underlying treasury rate term (in years)						1 month
Weighted average interest rate under derivative instruments (in hundredths)						1.693%
Floating to Fixed Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Amount of borrowings outstanding, subject to swaps				$ 225,000
Underlying treasury rate term (in years)				1 month
Weighted average interest rate under derivative instruments (in hundredths)				1.678%