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Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Data [Abstract] |
Quarterly Financial Information 2015 & 2014 |
2016 | Quarter Ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
Net revenues | $ | 59,018 |  |  | $ | 61,204 |  |  | $ | 63,251 |  |  | $ | 64,987 |
Investment and other gains | 1,665 |  |  | 26,415 |  |  | 1,657 |  |  | 6,175 |
Net income attributable to common stockholders | $ | 32,725 |  |  | $ | 44,595 |  |  | $ | 33,032 |  |  | $ | 41,188 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 38,401,647 |  |  | 38,520,221 |  |  | 39,283,919 |  |  | 39,847,860 |
Diluted | 38,414,791 |  |  | 38,561,384 |  |  | 39,651,900 |  |  | 39,993,445 |
Earnings per common share: |  |  |  |  |  |  |
Net income attributable to common stockholders - basic | $ | .85 |  |  | $ | 1.16 |  |  | $ | .84 |  |  | $ | 1.03 |
Net income attributable to common stockholders - diluted | $ | .85 |  |  | $ | 1.16 |  |  | $ | .83 |  |  | $ | 1.03 |
2017 | Quarter Ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
Net revenues | $ | 66,388 |  |  | $ | 69,836 |  |  | $ | 71,352 |  |  | $ | 71,083 |
Investment and other gains | 10,088 |  |  | — |  |  | — |  |  | — |
Net income attributable to common stockholders | $ | 44,230 |  |  | $ | 38,245 |  |  | $ | 39,092 |  |  | $ | 37,798 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 39,953,804 |  |  | 40,982,244 |  |  | 41,108,699 |  |  | 41,532,130 |
Diluted | 40,108,762 |  |  | 41,245,173 |  |  | 41,448,263 |  |  | 41,803,615 |
Earnings per common share: |  |  |  |  |  |  |
Net income attributable to common stockholders - basic | $ | 1.11 |  |  | $ | .93 |  |  | $ | .95 |  |  | $ | .91 |
Net income attributable to common stockholders - diluted | $ | 1.10 |  |  | $ | .93 |  |  | $ | .94 |  |  | $ | .90 |

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- Definition Selected Quarterly Financial Data [Abstract] + References No definition available. + Details
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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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