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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | Quarter |  |
|  | First |  | Second |  | Third |  | Fourth |  | Full Year
|  | (In thousands, except per share data)
Year Ended December 31, |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 2,432,854 |  |  | $ | 2,726,480 |  |  | $ | 2,800,569 |  |  | $ | 2,672,602 |  |  | $ | 10,632,505 |
Gross profit |  | 363,884 |  |  | 391,573 |  |  | 398,382 |  |  | 380,133 |  |  | 1,533,972 |
Net income |  | 35,815 |  |  | 46,310 |  |  | 45,261 |  |  | (33,387 | ) |  | 93,999 |
Basic earnings per share (1) |  | 1.47 |  |  | 1.91 |  |  | 1.88 |  |  | (1.41 | ) |  | 3.91 |
Diluted earnings per share (1) |  | 1.47 |  |  | 1.91 |  |  | 1.88 |  |  | (1.41 | ) |  | 3.90 |
2014 |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 2,260,863 |  |  | $ | 2,511,638 |  |  | $ | 2,626,448 |  |  | $ | 2,538,940 |  |  | $ | 9,937,889 |
Gross profit |  | 338,122 |  |  | 369,148 |  |  | 374,709 |  |  | 365,959 |  |  | 1,447,938 |
Net income |  | 31,303 |  |  | 16,862 |  |  | 26,162 |  |  | 18,677 |  |  | 93,004 |
Basic earnings per share (1) |  | 1.29 |  |  | 0.70 |  |  | 1.07 |  |  | 0.77 |  |  | 3.82 |
Diluted earnings per share (1) |  | 1.19 |  |  | 0.62 |  |  | 1.03 |  |  | 0.77 |  |  | 3.60 |
(1) The sum of the quarterly income per share amounts may not equal the annual amount reported, as per share amounts are computed independently for each quarter and for the full year based on the respective weighted average common shares outstanding.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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