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Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Results of Operations (Unaudited) [Abstract] |
Quarterly Results Of Operations | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | For the Three Months Ended |  |
﻿ | March 31, |  | June 30, | September 30, | December 31, (1) |
﻿2017 |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Total revenues | $ | 3,500 |  | $ | 3,577 |  | $ | 3,511 |  | $ | 3,669 |  |
﻿Total expenses |  | 3,025 |  |  | 3,044 |  |  | 3,001 |  |  | 4,057 |  |
﻿Net income (loss) |  | 435 |  |  | 411 |  |  | 418 |  |  | 816 |  |
﻿Earnings (loss) per common share – basic: |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income (loss) |  | 1.93 |  |  | 1.84 |  |  | 1.89 |  |  | 3.73 |  |
﻿Earnings (loss) per common share – diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income (loss) |  | 1.89 |  |  | 1.81 |  |  | 1.87 |  |  | 3.67 |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿2016 |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Total revenues | $ | 3,243 |  | $ | 3,307 |  | $ | 3,525 |  | $ | 3,255 |  |
﻿Total expenses |  | 3,008 |  |  | 2,893 |  |  | 2,913 |  |  | 3,058 |  |
﻿Net income (loss) |  | 211 |  |  | 325 |  |  | 467 |  |  | 189 |  |
﻿Earnings (loss) per common share – basic: |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income (loss) |  | 0.87 |  |  | 1.37 |  |  | 2.02 |  |  | 0.83 |  |
﻿Earnings (loss) per common share – diluted: |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income (loss) |  | 0.83 |  |  | 1.35 |  |  | 2.00 |  |  | 0.82 |  |
﻿ ﻿ (1) Fourth quarter 2017 results include a goodwill impairment charge and the impacts of remeasuring our existing deferred tax balances for the impact of the Tax Act as disclosed elsewhere herein

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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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