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Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Data [Abstract] |
Quarterly Financial Information 2015 & 2014 |
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 |
2018 | Quarter Ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
Net revenues | $ | 72,746 |  |  | $ | 72,956 |  |  | $ | 74,915 |  |  | $ | 73,995 |
Net income attributable to common stockholders | $ | 38,432 |  |  | $ | 37,839 |  |  | $ | 40,979 |  |  | $ | 37,083 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 41,532,154 |  |  | 41,704,819 |  |  | 42,187,077 |  |  | 42,351,443 |
Diluted | 41,576,876 |  |  | 41,786,829 |  |  | 42,434,499 |  |  | 42,568,720 |
Earnings per common share: |  |  |  |  |  |  |
Net income attributable to common stockholders - basic | $ | .93 |  |  | $ | .91 |  |  | $ | .97 |  |  | $ | .88 |
Net income attributable to common stockholders - diluted | $ | .92 |  |  | $ | .91 |  |  | $ | .97 |  |  | $ | .87 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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