Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Income	$ 118,959	$ 322,575	$ 345,343
Other Comprehensive Loss:
Net unrealized gain on derivatives			1,379
Reclassification adjustment of derivatives and designated hedges into net income	(890)	(887)	(4,302)
Retirement liability adjustment	123	153	85
Total			(2,838)
Total	(767)	(734)
Comprehensive Income	118,192	321,841	340,964
Comprehensive Income Attributable to Noncontrolling Interests	(6,810)	(7,140)	(17,742)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 111,382	$ 314,701	323,222
Cumulative Effect, Period of Adoption, Adjustment [Member]
Other Comprehensive Loss:
Cumulative effect adjustment of new accounting standards			$ (1,541)