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Significant Accounting Policies - EPS (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 32,000,000 |  |  |  | 32,000,000 | 32,000,000 |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |
Common stock, shares issued (in shares) | 21,964,809 |  |  |  | 21,964,809 | 21,743,498 |
Common stock, shares outstanding (in shares) | 21,964,809 |  |  |  | 21,964,809 | 21,743,498 |
Preferred stock, shares authorized | 8,000,000 |  |  |  | 8,000,000 | 8,000,000 |
Preferred stock, shares issued | 0 |  |  |  | 0 |  |
Preferred stock, shares outstanding | 0 |  |  |  | 0 | 0 |
Dividends declared, per share | $ 0.60 | $ 0.50 | $ 0.50 | $ 0.50 | $ 2.10 | $ 1.50 | $ 1.00
Dividends paid, per share | $ 0.60 | $ 0.50 | $ 0.50 | $ 0.50 |  |  |
Antidilutive stock options |  |  |  |  | 16,000 | 611,000 |
Weighted average shares outstanding used to compute basic earnings per share |  |  |  |  | 21,725,000 | 15,190,000 | 10,678,000
Incremental shares issuable upon the assumed exercise of stock options |  |  |  |  | 54,000 | 0 | 39,000
Unvested restricted stock and restricted stock units |  |  |  |  | 318,000 | 0 | 482,000
Shares used to compute diluted earnings (loss) per share |  |  |  |  | 22,097,000 | 15,190,000 | 11,199,000

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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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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