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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Retained Earnings | Accumulated Other Comprehensive Loss | Total
--- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2013 | 24,016 |  |  |
Beginning balance, value at Dec. 31, 2013 | $ 73,422 | $ 22,275 | $ (1,095) | $ 94,602
Common stock issued upon exercise of options and warrants, shares | 1,525 |  |  |
Common stock issued upon exercise of options and warrants | $ 3,256 |  |  | 3,256
Pension benefit obligation |  |  | (3,956) | (3,956)
Stock-based compensation | $ 3,835 |  |  | 3,835
Net income |  | 29,516 |  | 29,516
Ending balance, shares at Dec. 31, 2014 | 25,541 |  |  |
Ending balance, value at Dec. 31, 2014 | $ 80,513 | 51,791 | (5,051) | 127,253
Common stock issued upon exercise of options and warrants, shares | 1,140 |  |  |
Common stock issued upon exercise of options and warrants | $ 1,726 |  |  | 1,726
Repurchase of common stock, shares | (1,064) |  |  |
Repurchase of common stock, value | $ (5,926) |  |  | (5,926)
Pension benefit obligation |  |  | (1,599) | (1,599)
Stock-based compensation | $ 5,024 |  |  | 5,024
Net income |  | 34,681 |  | 34,681
Ending balance, shares at Dec. 31, 2015 | 25,617 |  |  |
Ending balance, value at Dec. 31, 2015 | $ 81,337 | 86,472 | (6,650) | 161,159
Common stock issued upon exercise of options and warrants, shares | 448 |  |  |
Common stock issued upon exercise of options and warrants | $ 706 |  |  | 706
Repurchase of common stock, shares | (2,478) |  |  |
Repurchase of common stock, value | $ (10,468) |  |  | (10,468)
Pension benefit obligation |  |  | (32) | (32)
Stock-based compensation | $ 5,553 |  |  | 5,553
Net income |  | 29,300 |  | 29,300
Ending balance, shares at Dec. 31, 2016 | 23,587 |  |  |
Ending balance, value at Dec. 31, 2016 | $ 77,128 | $ 115,772 | $ (6,682) | $ 186,218

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