Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue	$ 2,066,084	$ 1,869,275	$ 1,827,889
Cost of services and products	1,758,707	1,605,210	1,663,948
Other Asset Impairment Charges	0	0	70,445
Gross Margin	307,377	264,065	163,941
Selling, general and administrative expense	196,514	224,266	195,695
Goodwill, Impairment Loss	0	0	343,880
Income from Operations	110,863	39,799	(446,079)
Interest income	5,708	2,477	3,083
Interest expense, net of amounts capitalized	(38,215)	(38,810)	(43,900)
Equity earnings of unconsolidated affiliates	1,707	594	2,268
Other Nonoperating Expense	(1,011)	9,769	14,269
Income before Income Taxes	79,052	(5,709)	(498,897)
Income Tax Expense (Benefit)	53,111	43,598	(2,146)
Net Income	$ 25,941	$ (49,307)	$ (496,751)
Basic Earnings per Share	$ 0.26	$ (0.49)	$ (5.01)
Weighted Average Number of Shares Outstanding, Basic	100,185	99,706	99,233
Diluted Earnings per Share	$ 0.26	$ (0.49)	$ (5.01)
Weighted Average Number of Shares Outstanding, Diluted	101,447	99,706	99,233