Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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):

	June 30, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior Notes	$	3,060,345	$	3,169,530	$	2,913,217	$	3,056,896
Revolving Credit Facilities and term loans		598,266		601,321		598,242		601,131
Mortgage Indebtedness		908,055		933,534		982,509		1,012,869
	$	4,566,666	$	4,704,385	$	4,493,968	$	4,670,896