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Summary of Significant Accounting Policies - Net Income per Common Share (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Anti-dilutive common stock equivalents related to options and restricted stock awards excluded from fully diluted calculation (in shares) | 808 | 671 | 781
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |
Weighted average common shares outstanding—basic (in shares) | 17,072 | 16,419 | 15,834
Dilutive common shares issuable in connection with stock plans (in shares) | 0 | 0 | 0
Weighted average common shares outstanding—diluted (in shares) | 17,072 | 16,419 | 15,834

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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