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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Consolidated Statements Of Income (Loss) [Abstract] |  |
Revenues | $ 608,136 | $ 557,903
Cost of sales | 549,818 | 510,371
Selling, general and administrative expenses | 35,750 | 32,651
Amortization of Intangible Assets | 2,366 | 2,481
Restructuring charges and other costs | 2,235 | 1,511
Interest expense | 2,428 | 2,225
Interest income | 1,933 | 1,074
Other income (expense), net | 43 | (81)
Income tax expense | 41,156 | 1,102
Net income (loss) | $ (23,641) | $ 8,555
Earnings Per Share [Abstract] |  |
Basic | $ (0.49) | $ 0.17
Diluted | $ (0.49) | $ 0.17
Weighted Average Number of Shares Outstanding, Diluted [Abstract] |  |
Basic | 48,517 | 49,511
Diluted | 48,517 | 50,080
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 |  | $ 566,501
Cost of sales |  | (517,441)
Selling, general and administrative expenses |  | (32,651)
Amortization of Intangible Assets |  | (2,481)
Restructuring charges and other costs |  | (1,511)
Interest expense |  | 2,225
Interest income |  | 1,074
Other income (expense), net |  | (81)
Income tax expense |  | (1,498)
Net income (loss) |  | $ 9,687
Earnings Per Share [Abstract] |  |
Basic |  | $ 0.2
Diluted |  | $ 0.19
Weighted Average Number of Shares Outstanding, Diluted [Abstract] |  |
Basic |  | 49,511
Diluted |  | 50,080
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] | Adjustments [Member] |  |
Condensed Consolidated Statements Of Income (Loss) [Abstract] |  |
Revenues |  | $ (8,598)
Cost of sales |  | 7,070
Selling, general and administrative expenses |  | 0
Amortization of Intangible Assets |  | 0
Restructuring charges and other costs |  | 0
Interest expense |  | 0
Interest income |  | 0
Other income (expense), net |  | 0
Income tax expense |  | 396
Net income (loss) |  | $ (1,132)
Earnings Per Share [Abstract] |  |
Basic |  | $ (0.02)
Diluted |  | $ (0.02)
Weighted Average Number of Shares Outstanding, Diluted [Abstract] |  |
Basic |  | 49,511
Diluted |  | 50,080

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