Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue	$ 625,539	$ 810,303	$ 1,233,883	$ 1,597,075
Cost of services and products	530,306	642,758	1,041,170	1,266,081
Gross Margin	95,233	167,545	192,713	330,994
Selling, general and administrative expense	56,853	59,605	106,234	116,404
Income from Operations	38,380	107,940	86,479	214,590
Interest income	1,442	51	1,737	207
Interest expense	(6,207)	(6,212)	(12,599)	(12,300)
Equity earnings (losses) of unconsolidated affiliates	263	1	789	(254)
Other income (expense), net	(1,405)	(6,484)	(7,393)	(5,784)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	32,473	95,296	69,013	196,459
Provision for income taxes	10,164	29,828	21,601	61,492
Net Income	$ 22,309	$ 65,468	$ 47,412	$ 134,967
Cash Dividends declared per Share	$ 0.27	$ 0.27	$ 0.54	$ 0.54
Basic Earnings per Share	0.23	0.66	0.48	1.36
Diluted Earnings per Share	$ 0.23	$ 0.66	$ 0.48	$ 1.36