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Selected Quarterly Data | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Data | 21. Selected Quarterly Data (Unaudited)
|  | 2014 |
($ in thousands, except share data) |  | Fourth Quarter |  |  | Third Quarter (1) |  |  | Second Quarter |  |  | First Quarter |
Revenues |  | $ | 112,137 |  |  | $ | 117,841 |  |  | $ | 112,749 |  |  | $ | 107,871 |
Operating Income |  |  | 36,665 |  |  |  | 38,927 |  |  |  | 22,502 |  |  |  | 32,626 |
Net Income Attributable to Common Stockholders |  |  | 18,879 |  |  |  | 37,340 |  |  |  | 19,543 |  |  |  | 21,938 |
Earnings per share—Basic |  | $ | 2.09 |  |  | $ | 4.10 |  |  | $ | 2.14 |  |  | $ | 2.41 |
Earnings per share—Diluted |  | $ | 2.05 |  |  | $ | 4.02 |  |  | $ | 2.10 |  |  | $ | 2.34 |
|  | 2013 |
|  | Fourth Quarter |  |  | Third Quarter |  |  | Second Quarter |  |  | First Quarter |
Revenues |  | $ | 106,498 |  |  | $ | 100,409 |  |  | $ | 96,140 |  |  | $ | 86,168 |
Operating Income |  |  | 33,892 |  |  |  | 31,630 |  |  |  | 26,882 |  |  |  | 21,100 |
Net Income Attributable to Common Stockholders |  |  | 24,756 |  |  |  | 21,089 |  |  |  | 15,385 |  |  |  | 13,960 |
Earnings per share—Basic |  | $ | 2.72 |  |  | $ | 2.64 |  |  | $ | 1.97 |  |  | $ | 1.79 |
Earnings per share—Diluted |  | $ | 2.65 |  |  | $ | 2.56 |  |  | $ | 1.91 |  |  | $ | 1.73 |
(1) | The third quarter of 2014 includes a net tax benefit of approximately $15.5 million due to completion of the audit of the Company’s 2011 federal corporate income tax return.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: 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=35737889&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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