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Stock-Based Compensation - Stock Incentive Plan - Narratives (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 21, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2013
Stock-Based Compensation |  |  |  |  |
Treasury stock purchased |  | $ 1,759 | $ 2,788 | $ 1,515 |
Treasury Stock |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Treasury stock purchased, shares |  | 167,382 | 225,237 | 184,368 |
Treasury stock purchased |  | $ 1,759 | $ 2,788 | $ 1,515 |
2013 Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Maximum number of shares available under the Plan |  |  |  |  | 10,100,000
Additional shares authorized (shares) | 2,832,994 |  |  |  |
2013 Plan | On the settlement of employee stock purchase plan shares |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of shares counted by each award |  |  |  |  | 1
2013 Plan | Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of shares counted by each award |  |  |  |  | 1.75

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- Definition Represents the number of shares counted by each award against the aggregate share limit. + References No definition available. + Details
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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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