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Stock-Based Compensation Plans Market Stock Units (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
MSU Expense | $ 1,200,000 | $ 900,000
Number of Market Stock Units |  |
Outstanding on December 31, 2017 | 221,936 |
Granted | 32,194 |
Exchanged for stock (1) | (60,995) |
Outstanding on December 31, 2018 | 193,135 | 221,936
Maximum Shares Potentially Issuable |  |
Outstanding on December 31, 2017 | 332,904 |
Granted | 48,292 |
Exchanged for stock (1) | (46,799) |
Outstanding on December 31, 2018 | 279,542 | 332,904
Common shares issued in exchanged for MSUs | 46,799 |
MSU Shares Maximum vs Earned | 0 |
MSU Potential Common Shares Issuable Change | (54,855) |
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 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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