Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 54,248	$ 51,254
Other Comprehensive Income (Loss):
Reclassification adjustment of derivatives and designated hedges into net income	(221)	(219)
Retirement liability adjustment	297	288
Total	76	69
Comprehensive Income	54,324	51,323
Comprehensive Income Attributable to Noncontrolling Interests	(1,626)	(1,588)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 52,698	$ 49,735