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Share-Based Compensation - Summary of Additional Stock Option Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |
Total intrinsic value of stock options outstanding | [1] | $ 2,473 | $ 1,753 | $ 740
Total intrinsic value of stock options exercised |  | 0 | 0 | 1,474
Cash received from the exercise of stock options |  | 0 | 0 | 898
Tax benefits realized for tax deductions related to stock option exercises |  | $ 0 | $ 0 | $ 104
[1] | The intrinsic value of stock options outstanding represents the difference between our closing stock price on December 31 of each year and the exercise price, multiplied by the number of in-the-money stock options.

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Cash received from exercise of stock options. + References No definition available. + Details
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