Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 493,886	$ 416,413
Cost of services and products	466,299	397,585
Gross Margin	27,587	18,828
Selling, general and administrative expense	49,301	45,977
Income (Loss) from Operations	(21,714)	(27,149)
Interest income	2,604	2,592
Interest expense, net of amounts capitalized	(9,424)	(9,371)
Equity in income (losses) of unconsolidated affiliates	(164)	(843)
Other income (expense), net	719	(8,474)
Income (Loss) Before Income Taxes	(27,979)	(43,245)
Provision (benefit) for income taxes	(3,152)	5,888
Net Income (Loss)	$ (24,827)	$ (49,133)
Weighted average shares outstanding
Basic (in shares)	98,714	98,383
Diluted (in shares)	98,714	98,383
Earnings (loss) per share
Basic (in dollars per share)	$ (0.25)	$ (0.50)
Diluted (in dollars per share)	$ (0.25)	$ (0.50)