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Number of New Office Leases

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Represents the fair value of share-based awards other than options issued during the period.

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The increase (decrease) during the period in the carrying value of derivative instruments reported as assets that are due to be disposed of within one year (or the normal operating cycle, if longer).

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The increase (decrease) during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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- Definition

Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, after tax, of adjustments from accumulated other comprehensive income (AOCI) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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No definition available.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares (or other type of equity) forfeited during the period.

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No definition available.

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Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Value of forfeited shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Lease shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Jan. 01, 2019 USD ($)
Operating Lease, Liability	$ 161,313	$ 120,261
Supplemental disclosures of non-cash investing and financing activities
Common stock issued through the dividend reinvestment plan (in shares) \| shares	2,747	2,069	2,272
Common stock issued through the dividend reinvestment plan	$ 458	$ 418	$ 387
Number of shares withheld to satisfy employees' tax withholding and other liabilities \| shares	74,173	84,710	68,565
Shares withheld to satisfy employees' tax withholding and other liabilities, value	$ 14,919	$ 16,101	$ 10,556
Number of shares forfeited \| shares	7,683
Shares cancelled upon forfeiture	$ 1,240	399	717
Common stock dividends declared but not paid	223,262	214,832	204,191
Change in redemption value of redeemable noncontrolling interest	(210)	373	(223)
Increase (decrease) in derivative liabilities		6,379	6,366
Cash flow hedge losses reclassified to earnings	(8,984)	(6,571)	$ (6,143)
Right of use lease assets	133,581	103,063
Investments in unconsolidated real estate entities	202,612	165,806
Increase (decrease) in derivative assets	4,308	$ 388
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	1,413
New Office Leases
Operating Lease, Liability	46,875
Supplemental disclosures of non-cash investing and financing activities
Right of use lease assets	$ 46,875
Number of New Office Leases [Line Items] \| Lease	2
Restricted Stock and Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) \| shares	165,545	152,502	187,010
Restricted Stock Converted From Performance Shares [Member]
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) \| shares	96,317	73,072	88,297
Restricted stock
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) \| shares	69,228	79,430	98,713
Fair value of shares issued	$ 15,305	$ 15,603	$ 15,950
Number of shares forfeited \| shares	7,683	2,361	4,860
Accumulated earnings less dividends
Supplemental disclosures of non-cash investing and financing activities
Change in redemption value of redeemable noncontrolling interest	$ (210)	$ 373	$ (223)
Deferred Compensation, Share-based Payments [Member] \| Non-employee directors
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) \| shares		1,838
Fair value of shares issued		$ 205
NYC JV
Supplemental disclosures of non-cash investing and financing activities
Repayments of secured debt			395,939
NYC JV
Supplemental disclosures of non-cash investing and financing activities
Investments in unconsolidated real estate entities			$ 74,159
Equity Method Investment, Ownership Percentage	20.00%
Accounting Standards Update 2016-02
Operating Lease, Liability				$ 122,276
Supplemental disclosures of non-cash investing and financing activities
Right of use lease assets				$ 122,276