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Ownership, Description of Business, and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful Lives of Property and Equipment | The provision for depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets as follows:
Fixed Asset Category |  | Estimated Useful Life
Leasehold improvements |  | Lesser of lease term, including periods covered by renewal options, or useful life
Furniture, fixtures and equipment |  | 5 to 10 years
Computer hardware and software |  | 3 to 5 years
Reconciliation of Shares Used in Calculating Earnings Per Basic and Diluted Shares | A reconciliation of shares used in calculating earnings per basic and diluted shares follows (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted average common shares outstanding—basic | 25,972 |  |  | 25,713 |  |  | 25,722 |
Dilutive effect of stock-based awards | 255 |  |  | 196 |  |  | 253 |
Dilutive effect of convertible senior notes | 178 |  |  | — |  |  | 672 |
Weighted average common shares outstanding—diluted | 26,405 |  |  | 25,909 |  |  | 26,647 |

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- Definition Estimated useful lives of Property and Equipment. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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