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Condensed Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Accumulated Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2015 |  |  |  |  |  | $ 2,587
Comprehensive income | $ 62,801 |  |  |  |  |
Ending Balance at Sep. 30, 2016 |  |  |  |  |  | 6,596
Beginning Balance at Jun. 30, 2016 |  |  |  |  |  | 8,309
Comprehensive income | 16,183 |  |  |  |  |
Ending Balance at Sep. 30, 2016 |  |  |  |  |  | 6,596
Beginning Balance at Dec. 31, 2016 | $ 456,150 | $ 204 | $ 208,390 | $ (22,370) | $ 270,418 | (492)
Beginning Balance, Shares at Dec. 31, 2016 | 20,488,385 | 20,488,385 |  |  |  |
Treasury Stock Beginning Balance, Shares at Dec. 31, 2016 | (1,258,250) |  |  | (1,258,250) |  |
Comprehensive income | $ 49,107 |  |  |  | 45,582 | 3,525
Restricted common stock issued | 396 |  | 396 |  |  |
Restricted common stock issued, Shares |  | 13,888 |  |  |  |
Share-based compensation | 836 |  | 836 |  |  |
Dividends to shareholders | (11,544) |  |  |  | (11,544) |
Ending Balance at Sep. 30, 2017 | $ 494,945 | $ 204 | 209,622 | $ (22,370) | 304,456 | 3,033
Ending Balance, Shares at Sep. 30, 2017 | 20,502,273 | 20,502,273 |  |  |  |
Treasury Stock Ending Balance, Shares at Sep. 30, 2017 | (1,258,250) |  |  | (1,258,250) |  |
Beginning Balance at Jun. 30, 2017 |  |  |  |  |  | 2,416
Comprehensive income | $ 17,194 |  |  |  |  |
Ending Balance at Sep. 30, 2017 | $ 494,945 | $ 204 | $ 209,622 | $ (22,370) | $ 304,456 | $ 3,033
Ending Balance, Shares at Sep. 30, 2017 | 20,502,273 | 20,502,273 |  |  |  |
Treasury Stock Ending Balance, Shares at Sep. 30, 2017 | (1,258,250) |  |  | (1,258,250) |  |

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- Definition Amount of increase to additional paid-in capital (APIC) resulting from recognition of equity-based compensation for restricted stock units. + References No definition available. + Details
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- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation for stock options. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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