Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue	$ 608,344	$ 786,772
Cost of services and products	510,864	623,323
Gross Margin	97,480	163,449
Selling, general and administrative expense	49,381	56,799
Income from Operations	48,099	106,650
Interest income	295	156
Interest expense	(6,392)	(6,088)
Equity earnings (losses) of unconsolidated affiliates	526	(255)
Other income (expense), net	(5,988)	700
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	36,540	101,163
Provision for income taxes	11,437	31,664
Net Income	$ 25,103	$ 69,499
Cash Dividends declared per Share	$ 0.27	$ 0.27
Basic Earnings per Share	0.26	0.70
Diluted Earnings per Share	$ 0.26	$ 0.70