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Share-Based Compensation and Benefit Plans (Employee Stock Purchase Plan) (Narrative) (Details) - Employee stock purchase plan [Member] | 12 Months Ended
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Dec. 31, 2017 Rate
Share-Based Compensation and Benefit Plans |
Other employee benefit plan descriptions | The Company’s employee stock purchase plan (the “ESPP”) permits eligible employees to purchase shares of the Company’s common stock at 85% of the fair market value. Employees may authorize the Company to withhold up to 5% of their annual salary to participate in the plan.
Employee stock purchase plan stock purchase percentage | 85.00%

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- Definition Percent of fair market value of Company's common stock that eligible employees, participating in employee stock purchase plan, may purchase the stock at within the plan. + References No definition available. + Details
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- Definition General descriptive information regarding an arrangement under which employees receive compensation benefits. Such an arrangement is usually provided to employees to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References No definition available. + Details
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- Definition Line items disclose details pertaining to the Company's employee stock purchase plan (ESPP). + References No definition available. + Details
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- Details
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