Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue	$ 476,120	$ 549,275	$ 1,437,332	$ 1,783,158
Cost of services and products	421,235	513,832	1,284,021	1,555,002
Gross Margin	54,885	35,443	153,311	228,156
Selling, general and administrative expense	44,354	47,299	133,540	153,533
Income from Operations	10,531	(11,856)	19,771	74,623
Interest income	1,997	684	5,379	2,421
Interest expense	(8,650)	(6,325)	(22,517)	(18,924)
Equity earnings (losses) of unconsolidated affiliates	(424)	(246)	(1,798)	543
Other income (expense), net	(1,287)	570	(3,901)	(6,823)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	2,167	(17,173)	(3,066)	51,840
Provision for income taxes	3,935	(5,375)	4,104	16,226
Net Income	$ (1,768)	$ (11,798)	$ (7,170)	$ 35,614
Cash Dividends declared per Share	$ 0.15	$ 0.27	$ 0.45	$ 0.81
Basic Earnings per Share	$ (0.02)	$ (0.12)	$ (0.07)	$ 0.36
Weighted Average Number of Shares Outstanding, Basic	98,270	98,061	98,224	98,025
Diluted Earnings per Share	$ (0.02)	$ (0.12)	$ (0.07)	$ 0.36
Weighted Average Number of Shares Outstanding, Diluted	98,270	98,061	98,224	98,384