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Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Debt Instruments with Carrying Values Different than Estimated Fair Values

Debt instruments with carrying values that are different than estimated fair values are summarized as follows (in thousands):

	June 30, 2018								December 31, 2017
	Carrying Amount				Fair Value				Carrying Amount				Fair Value
Senior Notes	$	1,918,263			$	1,916,271			$	2,810,100			$	2,884,272
Revolving Credit Facilities and term loans		243,461				245,202				398,130				400,119
Mortgage Indebtedness		1,428,025				1,458,654				641,082				653,185
	$	3,589,749			$	3,620,127			$	3,849,312			$	3,937,576

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- Definition

Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

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