Financial Instruments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 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):

	March 31, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior Notes	$	2,914,186	$	3,026,001	$	2,913,217	$	3,056,896
Revolving Credit Facilities and term loans		688,409		691,460		598,242		601,131
Mortgage Indebtedness		918,331		946,958		982,509		1,012,869
	$	4,520,926	$	4,664,419	$	4,493,968	$	4,670,896