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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Quarterly Data |
| 2017
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
($ in thousands, except share data) |  |  |  |  |  |  |
Revenues | $ | 128,024 |  |  | $ | 123,675 |  |  | $ | 94,132 |  |  | $ | 79,776 |
Operating Income (Loss) | 28,015 |  |  | 16,789 |  |  | 3,184 |  |  | 10,047 |
Net Income (Loss) Attributable to Common Stockholders | 3,414 |  |  | 16,708 |  |  | (2,389 | ) |  | 10,943 |
Earnings (loss) per share—Basic | $ | 0.48 |  |  | $ | 2.32 |  |  | $ | (0.34 | ) |  | $ | 1.67 |
Earnings (loss) per share—Diluted | $ | 0.46 |  |  | $ | 2.21 |  |  | $ | (0.34 | ) |  | $ | 1.62 |
| 2016
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
($ in thousands, except share data) |  |  |  |  |  |  |
Revenues | $ | 79,850 |  |  | $ | 82,324 |  |  | $ | 80,085 |  |  | $ | 80,295 |
Operating Income (Loss) | 12,783 |  |  | 16,538 |  |  | 8,743 |  |  | 12,750 |
Net Income (Loss) Attributable to Common Stockholders | 12,426 |  |  | 15,625 |  |  | 8,088 |  |  | 12,363 |
Earnings (loss) per share—Basic | $ | 1.94 |  |  | $ | 2.04 |  |  | $ | 0.99 |  |  | $ | 1.48 |
Earnings (loss) per share—Diluted | $ | 1.87 |  |  | $ | 1.99 |  |  | $ | 0.97 |  |  | $ | 1.45 |

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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=84173487&loc=d3e1280-108306 + Details
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