Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 478,674	$ 515,036	$ 895,087	$ 961,212
Cost of services and products	448,946	461,465	846,531	862,786
Gross Margin	29,728	53,571	48,556	98,426
Selling, general and administrative expense	49,365	44,181	95,342	89,186
Income from Operations	(19,637)	9,390	(46,786)	9,240
Interest income	2,950	2,045	5,542	3,382
Interest expense	(8,802)	(7,599)	(18,173)	(13,867)
Equity earnings (losses) of unconsolidated affiliates	(737)	(394)	(1,580)	(1,374)
Other income (expense), net	(3,556)	(58)	(12,030)	(2,614)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(29,782)	3,384	(73,027)	(5,233)
Provision for income taxes	3,294	1,252	9,182	169
Net Income	$ (33,076)	$ 2,132	$ (82,209)	$ (5,402)
Cash Dividends declared per Share	$ 0.00	$ 0.15	$ 0.00	$ 0.30
Basic Earnings per Share	$ (0.34)	$ 0.02	$ (0.83)	$ (0.06)
Weighted Average Number of Shares Outstanding, Basic	98,531	98,263	98,457	98,201
Diluted Earnings per Share	$ (0.34)	$ 0.02	$ (0.83)	$ (0.06)
Weighted Average Number of Shares Outstanding, Diluted	98,531	98,751	98,457	98,201