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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Class A Common Stock [Member] | Class B Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 104,209 | $ 64 | $ 8 | $ 51,061 | $ 81,746 | $ (28,670)
Balance, shares at Dec. 31, 2012 |  | 6,369 | 797 |  |  |
Net income | 15,273 |  |  |  | 15,273 |
Conversion of shares from Class B to Class A | 0 |  |  |  |  |
Conversion of shares from Class B to Class A (in shares) |  | 1 | (1) |  |  |
Issuance of restricted stock | 0 |  |  |  |  |
Issuance of restricted stock (in shares) |  | 30 | 20 |  |  |
Net proceeds from exercised options | 275 |  |  | 275 |  |
Net proceeds from exercised options (in shares) |  | 9 |  |  |  |
Dividends declared per common share | (10,326) |  |  |  | (10,326) |
Compensation expense related to restricted stock awards | 135 |  |  | 135 |  |
Purchase of shares held in treasury | (95) |  |  |  |  | (95)
401(k) plan contribution | 230 |  |  | (15) |  | 245
Balance at Dec. 31, 2013 | 109,701 | $ 64 | $ 8 | 51,456 | 86,693 | (28,520)
Balance, shares at Dec. 31, 2013 |  | 6,409 | 816 |  |  |
Net income | 14,904 |  |  |  | 14,904 |
Conversion of shares from Class B to Class A | 0 |  |  |  |  |
Conversion of shares from Class B to Class A (in shares) |  | 3 | (3) |  |  |
Issuance of restricted stock | 0 |  |  |  |  |
Issuance of restricted stock (in shares) |  | 27 | 30 |  |  |
Net proceeds from exercised options | 244 |  |  | 244 |  |
Net proceeds from exercised options (in shares) |  | 7 |  |  |  |
Dividends declared per common share | (10,419) |  |  |  | (10,419) |
Compensation expense related to restricted stock awards | 826 |  |  | 826 |  |
Purchase of shares held in treasury | (254) |  |  |  |  | (254)
401(k) plan contribution | 243 |  |  | (30) |  | 273
Balance at Dec. 31, 2014 | 115,245 | $ 64 | $ 8 | 52,496 | 91,178 | (28,501)
Balance, shares at Dec. 31, 2014 |  | 6,446 | 843 |  |  |
Net income | 13,414 |  |  |  | 13,414 |
Conversion of shares from Class B to Class A | 0 | $ 1 | $ (1) |  |  |
Conversion of shares from Class B to Class A (in shares) |  | 40 | (40) |  |  |
Issuance of restricted stock | 0 |  |  |  |  |
Issuance of restricted stock (in shares) |  | 26 | 30 |  |  |
Forfeiture of restricted stock | 0 |  |  |  |  |
Forfeiture of restricted stock (in shares) |  | (2) |  |  |  |
Net proceeds from exercised options | (767) | $ 1 | $ 1 | 3,393 |  | (4,162)
Net proceeds from exercised options (in shares) |  | 93 | 32 |  |  |
Dividends declared per common share | (6,412) |  |  |  | (6,412) |
Compensation expense related to restricted stock awards | 1,655 |  |  | 1,655 |  |
Purchase of shares held in treasury | (563) |  |  |  |  | (563)
401(k) plan contribution | 244 |  |  | (34) |  | 278
Balance at Dec. 31, 2015 | $ 122,816 | $ 66 | $ 8 | $ 57,510 | $ 98,180 | $ (32,948)
Balance, shares at Dec. 31, 2015 |  | 6,603 | 865 |  |  |

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