Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value

	As of June 30, 2017
(Amounts in thousands)	Total		Level 1		Level 2			Level 3
Marketable securities	$	31,077	$	31,077		$	-		$	-
	As of December 31, 2016
(Amounts in thousands)	Total		Level 1		Level 2			Level 3
Marketable securities	$	37,918	$	37,918		$	-		$	-

Financial Assets and Liabilities Not Measured at Fair Value

The table below summarizes the carrying amounts and fair value of these financial instruments as of June 30, 2017 and December 31, 2016.

	As of June 30, 2017						As of December 31, 2016
(Amounts in thousands)	Carrying     Amount			Fair     Value			Carrying     Amount			Fair     Value
Assets:
Cash equivalents		$	431,280		$	431,280		$	256,370		$	256,370
Liabilities:
Mortgages payable (excluding deferred debt issuance costs)		$	1,254,328		$	1,245,000		$	1,056,147		$	1,045,000