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Selected Quarterly Data (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Quarterly Data |
|  | 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 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=35737889&loc=d3e1280-108306 + Details
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