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Stock Incentive Plan and Other Equity Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Sale of Stock [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  | 375 |
Shares issued under share-based compensation (in shares) |  |  |  |  | 179 |
Stock-based compensation expense |  |  |  |  | $ 1,670 | $ 1,383
Purchase of treasury stock | $ 0 | $ 3,201 |  |  |  |
Shares withheld for taxes | $ 98 | $ 564 | $ 107 | $ 194 |  |
Common Stock |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  |  | 250 |
Purchase of treasury stock |  |  |  |  | $ 3,201 |
Shares withheld for taxes (in shares) | 7 |  |  |  | 59 |
Shares withheld for taxes | $ 98 |  |  |  | $ 662 |
Additional Paid in Capital |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 649 |  | 766 |  | $ 1,670 | $ 1,383
Shares withheld for taxes | $ 98 |  | $ 108 | $ 193 |  |
Common Stock |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Purchase of treasury stock (in shares) |  | 250 |  |  |  |
Shares withheld for taxes (in shares) | 7 | 52 | 10 | 13 |  |
Shares withheld for taxes |  |  | $ (1) | $ 1 |  |
RSAs |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  | 52 |
Weighted Average Grant-Date Fair Value per Share (in dollars per share) |  |  |  |  | $ 12.06 |
RSUs |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  | 138 |
Weighted Average Grant-Date Fair Value per Share (in dollars per share) |  |  |  |  | $ 10.96 |
Shares issued under share-based compensation (in shares) |  |  |  |  | 73 |
PSUs |  |  |  |  |  |
Sale of Stock [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  | 185 |
Weighted Average Grant-Date Fair Value per Share (in dollars per share) |  |  |  |  | $ 10.89 |
Shares issued under share-based compensation (in shares) |  |  |  |  | 54 |

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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 The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -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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