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Stock-Based Compensation Plans Market Stock Units (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
MSU Expense | $ 900,000 | $ 500,000 | $ 500,000
Number of Market Stock Units |  |  |
Outstanding on December 31, 2016 | 149,532 |  |
Granted | 98,243 |  |
Cancelled | (25,839) |  |
Outstanding on December 31, 2017 | 221,936 | 149,532 |
Maximum Shares Potentially Issuable |  |  |
Outstanding on December 31, 2016 | 224,298 |  |
Granted | 147,365 |  |
Cancelled | (38,759) |  |
Outstanding on December 31, 2017 | 332,904 | 224,298 |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Potential Shares From MSU Vest | $ 0 |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Potential Shares From MSU Vest | $ 1.50 |  |
Trading days | 60 days |  |

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- Definition MSU Expense + References No definition available. + Details
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- Definition MSU Grants + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Market Stock Unit, Outstanding [Roll Forward] + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Market Stock Units, Potentially Issuable Shares [Roll Forward] + References No definition available. + Details
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- Definition Common Shares Issued in Exchange for Vested Market Stock Units (MSUs) + References No definition available. + Details
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- Definition Trading days + 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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