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Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Paid-in Capital | Accumulated Earnings | Loss on Pension Benefit Obligation | Currency Translation Adjustments | Foreign Currency Hedge Adjustment | Commodity Hedge Adjustment | Interest Rate Hedge Adjustment | Total Gentherm Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 215,163 | $ 166,309 | $ 24,120 | $ (17,383) | $ (1,202) | $ (9,805) |  |  | $ (224) | $ 161,815 | $ 53,348
Beginning Balance (in shares) at Dec. 31, 2012 |  | 29,818,000 |  |  |  |  |  |  |  |  |
Acquisition of non-controlling interest | (45,637) | $ 42,517 | (35,080) |  |  |  |  |  |  | 7,437 | (53,074)
Acquisition of non-controlling interest (in shares) |  | 3,300,000 |  |  |  |  |  |  |  |  |
Exercise of Common Stock options for cash | $ 4,801 | $ 6,624 | (1,823) |  |  |  |  |  |  | 4,801 |
Exercise of Common Stock options for cash (in shares) | 672,753 | 673,000 |  |  |  |  |  |  |  |  |
Tax benefit from Exercises of Common Stock options | $ 2,074 |  | 2,074 |  |  |  |  |  |  | 2,074 |
Common Stock issued to Board of Directors and employees | 1,509 | $ 1,509 |  |  |  |  |  |  |  | 1,509 |
Common Stock issued to Board of Directors and employees (in shares) |  | 184,000 |  |  |  |  |  |  |  |  |
Stock option compensation | 1,127 |  | 1,127 |  |  |  |  |  |  | 1,127 |
Convertible preferred stock dividends | (1,622) |  |  | (1,622) |  |  |  |  |  | (1,622) |
Stock issued upon conversion of preferred stock | 15,108 | $ 15,108 |  |  |  |  |  |  |  | 15,108 |
Stock issued upon conversion of preferred stock (in shares) |  | 954,000 |  |  |  |  |  |  |  |  |
Distribution paid to non-controlling interest | (6) |  |  | (3) |  |  |  |  |  | (3) | (3)
Net gain (loss) on pension benefit obligation | 144 |  |  |  | 144 |  |  |  |  | 144 |
Currency translation, net | 4,157 |  |  |  |  | 5,741 |  |  |  | 5,741 | (1,584)
Interest rate hedge, net | 143 |  |  |  |  |  |  |  | 143 | 143 |
Net Income | 35,133 |  |  | 33,820 |  |  |  |  |  | 33,820 | $ 1,313
Ending Balance at Dec. 31, 2013 | 232,094 | $ 232,067 | (9,582) | 14,812 | (1,058) | (4,064) |  |  | (81) | 232,094 |
Ending Balance (in shares) at Dec. 31, 2013 |  | 34,929,000 |  |  |  |  |  |  |  |  |
Exercise of Common Stock options for cash | $ 7,176 | $ 9,595 | (2,419) |  |  |  |  |  |  | 7,176 |
Exercise of Common Stock options for cash (in shares) | 731,142 | 731,000 |  |  |  |  |  |  |  |  |
Tax benefit from Exercises of Common Stock options | $ 1,831 |  | 1,831 |  |  |  |  |  |  | 1,831 |
Common Stock issued to Board of Directors and employees | 2,706 | $ 2,706 |  |  |  |  |  |  |  | 2,706 |
Common Stock issued to Board of Directors and employees (in shares) |  | 105,000 |  |  |  |  |  |  |  |  |
Stock option compensation | 1,946 |  | 1,946 |  |  |  |  |  |  | 1,946 |
Cancelation of restricted stock | (1,113) | $ (1,113) |  |  |  |  |  |  |  | (1,113) |
Cancelation of restricted stock (in shares) |  | (68,000) |  |  |  |  |  |  |  |  |
Net gain (loss) on pension benefit obligation | (1,615) |  |  |  | (1,615) |  |  |  |  | (1,615) |
Currency translation, net | (18,996) |  |  |  |  | (18,996) |  |  |  | (18,996) |
Foreign currency hedge, net | (10) |  |  |  |  |  | $ (10) |  |  | (10) |
Interest rate hedge, net | 81 |  |  |  |  |  |  |  | $ 81 | 81 |
Net Income | 70,119 |  |  | 70,119 |  |  |  |  |  | 70,119 |
Ending Balance at Dec. 31, 2014 | $ 294,219 | $ 243,255 | (8,224) | 84,931 | (2,673) | (23,060) | (10) |  |  | 294,219 |
Ending Balance (in shares) at Dec. 31, 2014 | 35,696,742 | 35,697,000 |  |  |  |  |  |  |  |  |
Exercise of Common Stock options for cash | $ 9,273 | $ 12,146 | (2,873) |  |  |  |  |  |  | 9,273 |
Exercise of Common Stock options for cash (in shares) | 571,723 | 571,000 |  |  |  |  |  |  |  |  |
Tax benefit from Exercises of Common Stock options | $ 6,681 |  | 6,681 |  |  |  |  |  |  | 6,681 |
Common Stock issued to Board of Directors and employees | 3,734 | $ 3,734 |  |  |  |  |  |  |  | 3,734 |
Common Stock issued to Board of Directors and employees (in shares) |  | 108,000 |  |  |  |  |  |  |  |  |
Stock option compensation | 3,025 |  | 3,025 |  |  |  |  |  |  | 3,025 |
Cancelation of restricted stock | (2,216) | $ (2,216) |  |  |  |  |  |  |  | (2,216) |
Cancelation of restricted stock (in shares) |  | (54,000) |  |  |  |  |  |  |  |  |
Net gain (loss) on pension benefit obligation | 613 |  |  |  | 613 |  |  |  |  | 613 |
Currency translation, net | (26,212) |  | 109 |  |  | (26,321) |  |  |  | (26,212) |
Foreign currency hedge, net | 10 |  |  |  |  |  | $ 10 |  |  | 10 |
Commodity hedge, net | (229) |  |  |  |  |  |  | $ (229) |  | (229) |
Net Income | 95,393 |  |  | 95,393 |  |  |  |  |  | 95,393 |
Ending Balance at Dec. 31, 2015 | $ 384,291 | $ 256,919 | $ (1,282) | $ 180,324 | $ (2,060) | $ (49,381) |  | $ (229) |  | $ 384,291 |
Ending Balance (in shares) at Dec. 31, 2015 | 36,321,775 | 36,322,000 |  |  |  |  |  |  |  |  |

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