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Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

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):

	December 31, 2017								December 31, 2016
	Carrying Amount				Fair Value				Carrying Amount				Fair Value
Senior Notes	$	2,810,100			$	2,884,272			$	2,913,217			$	3,009,232
Revolving Credit Facilities and term loans		398,130				400,119				598,242				600,050
Mortgage Indebtedness		641,082				653,185				982,509				1,009,884
	$	3,849,312			$	3,937,576			$	4,493,968			$	4,619,166

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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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