Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 115,881	$ 54,956
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	160	204
Total other comprehensive loss	160	204
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	116,041	55,160
Net income attributable to noncontrolling interests	(87)	(66)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 115,954	$ 55,094