Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 27,461	$ 108,509	$ 94,086	$ 245,283
Other Comprehensive Income:
Reclassification adjustment of derivatives and designated hedges into net income	(221)	(223)	(666)	(663)
Retirement liability adjustment	225	305	795	892
Total	4	82	129	229
Comprehensive Income	27,465	108,591	94,215	245,512
Comprehensive Income Attributable to Noncontrolling Interests	(2,372)	(1,767)	(5,007)	(5,066)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 25,093	$ 106,824	$ 89,208	$ 240,446