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Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2016 | $ 155,136 | $ 0 | $ 143,284 | $ 11,761 | $ 91
Balance, beginning of year, shares at Dec. 31, 2016 |  | 1,884 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income attributable to the Company | 10,151 |  | 10,151 |  |
Dividends paid | (1,038) |  | (1,038) |  |
Shares of common stock repurchased and retired (in shares) |  | 0 |  |  |
Shares of common stock repurchased and retired | (9) |  | (9) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 3 |  |  |
Stock options and stock appreciation rights exercised | (1) |  | (1) |  |
Share-based compensation expense related to stock appreciation rights | 95 |  | 95 |  |
Amortization related to postretirement health benefits | 3 |  |  | 3 |
Net unrealized gain (loss) on investments | 1,904 |  |  | 1,904 |
Net loss attributable to noncontrolling interests | (11) |  |  |  | (11)
Balance, end of year at Jun. 30, 2017 | 166,230 | $ 0 | 152,482 | 13,668 | 80
Balance, end of year, shares at Jun. 30, 2017 |  | 1,887 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative effect adjustment for adoption of new accounting standards | 0 |  | 13,627 | (13,627) |
Balance, beginning of year at Dec. 31, 2017 | 177,921 | $ 0 | 161,891 | 15,945 | 85
Balance, beginning of year, shares at Dec. 31, 2017 |  | 1,886 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income attributable to the Company | 11,123 |  | 11,123 |  |
Dividends paid | (1,509) |  | (1,509) |  |
Shares of common stock repurchased and retired (in shares) |  | 0 |  |  |
Shares of common stock repurchased and retired | (29) |  | (29) |  |
Stock options and stock appreciation rights exercised (in shares) |  | 1 |  |  |
Stock options and stock appreciation rights exercised | (1) |  | (1) |  |
Share-based compensation expense related to stock appreciation rights | 150 |  | 150 |  |
Net unrealized gain (loss) on investments | (1,512) |  |  | (1,512) |
Net loss attributable to noncontrolling interests | (30) |  |  |  | (30)
Balance, end of year at Jun. 30, 2018 | $ 186,113 | $ 0 | $ 185,252 | $ 806 | $ 55
Balance, end of year, shares at Jun. 30, 2018 |  | 1,887 |  |  |

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