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Compensation Plans - 401(k) Plan (Details) - 401K - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of common stock related to 401k plan match (in shares) | 11,967 | 8,478 | 9,466
Expenses attributable to the 401(k) Plan | $ 2,231,735 | $ 1,710,785 | $ 1,738,287

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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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