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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 | 4,476 |  | 4,476 |  |
Dividends | (377) |  | (377) |  |
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) |  | 2 |  |  |
Stock options and stock appreciation rights exercised | (1) |  | (1) |  |
Share-based compensation expense | 32 |  | 32 |  |
Amortization related to postretirement health benefits | 2 |  |  | 2 |
Net unrealized gain (loss) on investments | 1,038 |  |  | 1,038 |
Net loss attributable to noncontrolling interests | (10) |  |  |  | (10)
Balance, end of year at Mar. 31, 2017 | 160,287 | $ 0 | 147,405 | 12,801 | 81
Balance, end of year, shares at Mar. 31, 2017 |  | 1,886 |  |  |
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 | 4,176 |  | 4,176 |  |
Dividends | (755) |  | (755) |  |
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 | 62 |  | 62 |  |
Net unrealized gain (loss) on investments | (1,309) |  |  | (1,309) |
Net loss attributable to noncontrolling interests | (3) |  |  |  | (3)
Balance, end of year at Mar. 31, 2018 | $ 180,062 | $ 0 | $ 178,971 | $ 1,009 | $ 82
Balance, end of year, shares at Mar. 31, 2018 |  | 1,887 |  |  |

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