Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 17,865	$ (9,700)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	9,118	9,596
Straight-lining of rental income	645	1,445
Change in fair value of marketable securities	(38)	5,170
Liability related to discontinued operations (see Note 7)	0	23,797
Changes in operating assets and liabilities:
Tenant and other receivables, net	(1,123)	(214)
Other assets	13,340	13,558
Amounts due to Vornado	710	(1,778)
Accounts payable and accrued expenses	7,717	(5,030)
Other liabilities	(151)	(39)
Net cash provided by operating activities	48,083	36,805
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(1,816)	(628)
Repayment of Rego Park II loan participation	0	753
Net cash (used in) provided by investing activities	(1,816)	125
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	0	(971)
Dividends paid	(23,028)	(23,022)
Net cash used in financing activities	(23,028)	(23,993)
Net increase in cash and cash equivalents and restricted cash	23,239	12,937
Cash and cash equivalents and restricted cash at beginning of period	289,495	393,279
Cash and cash equivalents and restricted cash at end of period	312,734	406,216
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	283,056	307,536
Restricted cash at beginning of period	6,439	85,743
Cash and cash equivalents and restricted cash at beginning of period	289,495	393,279
Cash and cash equivalents at end of period	302,944	319,026
Restricted cash at end of period	9,790	87,190
Cash and cash equivalents and restricted cash at end of period	312,734	406,216
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	8,965	8,356
NON-CASH TRANSACTIONS
Lease liability arising from the recognition of right-of-use asset	5,428	0
Reclassification of prepaid real estate taxes to construction in progress for property in redevelopment	1,466	0
Liability for real estate additions, including $24 and $27 for development fees due to Vornado in 2019 and 2018, respectively	829	1,028
Write-off of fully amortized and/or depreciated assets	$ 0	$ 11,223

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Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration