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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 45 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Jun. 12, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized | 110,000,000 |  | 110,000,000 |
Preferred stock, par value per share (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, shares authorized | 10,000,000 | 10,000,000 | 10,000,000 |
Preferred stock, shares outstanding | 0 | 0 | 0 |
Shares available for grant | 1,409,000 |  | 1,409,000 | 4,500,000
Number of shares repurchased under share repurchase plan |  |  | 10,663,888 |
Treasury shares that were previously surrendered by employees to satisfy tax withholdings |  |  | 574,107 |
Treasury Stock, Shares | 11,237,995 | 11,135,590 | 11,237,995 |
Incremental stock-based compensation expense |  | $ 0.5 |  |
Common stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period for awards | 7 years |  |  |
Unrecognized stock-based compensation, options | $ 3.4 |  | $ 3.4 |
Recognition period for unrecognized stock-based compensation expense | 2 years 6 months 22 days |  |  |
Common stock options | Period One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting term for awards | 4 years |  |  |
Vesting percent | 25.00% |  |  |
Common stock options | Period Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting term for awards | 1 year |  |  |
Vesting percent | 2.08% |  |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation, restricted stock units | $ 17.8 |  | $ 17.8 |
Recognition period for unrecognized stock-based compensation expense | 2 years 8 months 1 day |  |  |
Restricted stock units | Period One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting term for awards | 4 years |  |  |
Vesting percent | 25.00% |  |  |
Restricted stock units | Period Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting term for awards | 1 year |  |  |
Vesting percent | 25.00% |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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