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New Accounting Pronouncements (Condensed Consolidated Statement Of Income) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements Of Income (Loss) [Abstract]
Revenues	$ 640,688	$ 610,929	$ 1,909,415	$ 1,788,443
Cost of sales	587,911	552,686	1,744,021	1,623,184
Income tax expense	2,094	1,688	45,653	5,911
Net income (loss)	$ 7,799	$ 17,831	$ (4,899)	$ 44,460
Earnings Per Share [Abstract]
Basic	$ 0.17	$ 0.36	$ (0.1)	$ 0.89
Diluted	$ 0.17	$ 0.35	$ (0.1)	$ 0.88
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic	46,301	49,865	47,415	49,716
Diluted	46,455	50,330	47,415	50,292
Accounting Standards Update 2014-09 [Member] | As Previously Reported [Member] | Calculated Under Revenue Guidance In Effect Before Topic 606 [Member]
Condensed Consolidated Statements Of Income (Loss) [Abstract]
Revenues		$ 603,550		$ 1,786,955
Cost of sales		545,395		1,621,153
Income tax expense		1,919		6,539
Net income (loss)		$ 17,512		$ 44,375
Earnings Per Share [Abstract]
Basic		$ 0.35		$ 0.89
Diluted		$ 0.35		$ 0.88
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic		49,865		49,716
Diluted		50,330		50,292
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] | Adjustments [Member]
Condensed Consolidated Statements Of Income (Loss) [Abstract]
Revenues		$ 7,379		$ 1,488
Cost of sales		7,291		2,031
Income tax expense		(231)		(628)
Net income (loss)		$ 319		$ 85
Earnings Per Share [Abstract]
Basic		$ 0.01		$ 0
Diluted		$ 0		$ 0
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic		49,865		49,716
Diluted		50,330		50,292

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