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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data | QUARTERLY FINANCIAL DATA (Dollars in thousands, except per share amounts) (Unaudited)
|  | Fourth Quarter 2016 |  |  | Third Quarter 2016 |  |  | Second Quarter 2016 |  |  | First Quarter 2016 |
Revenue |  | $ | 892,829 |  |  | $ | 787,938 |  |  | $ | 775,223 |  |  | $ | 711,644 |
Operating income |  | $ | 63,765 |  |  | $ | 58,461 |  |  | $ | 53,093 |  |  | $ | 47,932 |
Income before income taxes |  | $ | 62,696 |  |  | $ | 57,513 |  |  | $ | 52,205 |  |  | $ | 47,043 |
Income taxes |  |  | 23,122 |  |  |  | 21,235 |  |  |  | 19,891 |  |  |  | 17,859 |
Net income |  | $ | 39,574 |  |  | $ | 36,278 |  |  | $ | 32,314 |  |  | $ | 29,184 |
Earnings per common share (1) |  | $ | 0.95 |  |  | $ | 0.86 |  |  | $ | 0.77 |  |  | $ | 0.69 |
Diluted earnings per share (1) |  | $ | 0.94 |  |  | $ | 0.86 |  |  | $ | 0.76 |  |  | $ | 0.69 |
Dividends per common share |  | $ | 0.09 |  |  | $ | 0.09 |  |  | $ | 0.08 |  |  | $ | 0.08 |
|  | Fourth Quarter 2015 |  |  | Third Quarter 2015 |  |  | Second Quarter 2015 |  |  | First Quarter 2015 |
Revenue |  | $ | 848,602 |  |  | $ | 841,726 |  |  | $ | 868,383 |  |  | $ | 762,380 |
Operating income |  | $ | 62,648 |  |  | $ | 63,980 |  |  | $ | 66,033 |  |  | $ | 49,045 |
Income before income taxes |  | $ | 61,907 |  |  | $ | 63,266 |  |  | $ | 65,320 |  |  | $ | 48,264 |
Income taxes |  |  | 24,052 |  |  |  | 23,918 |  |  |  | 24,849 |  |  |  | 18,249 |
Net income |  | $ | 37,855 |  |  | $ | 39,348 |  |  | $ | 40,471 |  |  | $ | 30,015 |
Earnings per common share (1) |  | $ | 0.89 |  |  | $ | 0.91 |  |  | $ | 0.92 |  |  | $ | 0.67 |
Diluted earnings per share (1) |  | $ | 0.88 |  |  | $ | 0.90 |  |  | $ | 0.92 |  |  | $ | 0.67 |
Dividends per common share |  | $ | 0.08 |  |  | $ | 0.08 |  |  | $ | 0.07 |  |  | $ | 0.07 |
(1) | Due to the changes in the number of average common shares and common stock equivalents outstanding during the year, the sum of earnings per share amounts for each quarter do not necessarily sum in the aggregate to the earnings per share amounts for the full year.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=68076893&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration