Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 519,300	$ 476,120	$ 1,414,387	$ 1,437,332
Cost of services and products, adjusted			1,332,238
Cost of services and products	471,665	421,235	1,318,196	1,284,021
Gross Margin	47,635	54,885	96,191	153,311
Selling, general and administrative expense	49,187	44,354	144,529	133,540
Income from Operations	(1,552)	10,531	(48,338)	19,771
Interest income	2,645	1,997	8,187	5,379
Interest expense	(9,885)	(8,650)	(28,058)	(22,517)
Equity earnings (losses) of unconsolidated affiliates	(1,684)	(424)	(3,264)	(1,798)
Other income (expense), net	5,632	(1,287)	(6,398)	(3,901)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(4,844)	2,167	(77,871)	(3,066)
Provision for income taxes	61,135	3,935	70,317	4,104
Net Income	$ (65,979)	$ (1,768)	$ (148,188)	$ (7,170)
Cash Dividends declared per Share	$ 0.00	$ 0.15	$ 0.00	$ 0.45
Basic Earnings per Share	$ (0.67)	$ (0.02)	$ (1.50)	$ (0.07)
Weighted Average Number of Shares Outstanding, Basic	98,533	98,270	98,483	98,224
Diluted Earnings per Share	$ (0.67)	$ (0.02)	$ (1.50)	$ (0.07)
Weighted Average Number of Shares Outstanding, Diluted	98,533	98,270	98,483	98,224