Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 25,016	$ 25,644	$ 140,897	$ 80,600
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	161	204	321	408
Total other comprehensive loss	161	204	321	408
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	25,177	25,848	141,218	81,008
Net income attributable to noncontrolling interests	303	(67)	216	(133)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 25,480	$ 25,781	$ 141,434	$ 80,875