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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2013 | $ 5,978 | $ 410,615 | $ (16,793) | $ 1,692,140 | $ (81,254) | $ 11,467 |
Excess (deficit) of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 8,345 |  |  |  |  |
Tax benefit (expense) realized from equity compensation plans |  | 6,119 |  |  |  |  | $ 6,119
Issuance of restricted stock, net of forfeitures |  | (8,195) |  |  |  |  |
Amortization of unearned compensation |  | 11,591 |  |  |  |  |
Acquisitions of noncontrolling interests |  | 0 |  |  |  | 0 |
Net earnings attributable to Kirby for the year |  |  |  | 282,006 |  |  | 282,006
Purchase of treasury stock (35,000 in 2016 and 3,316,000 in 2015) |  |  |  |  | (15,321) |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (170,000 in 2016, 166,000 in 2015 and 211,000 in 2014) |  |  |  |  | 3,049 |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 2,602 | 2,602
Return of investment to noncontrolling interests |  |  |  |  |  | (3,192) | 3,192
Other comprehensive income (loss), net of taxes |  |  | (44,244) |  |  |  | (44,244)
Balance at end of year at Dec. 31, 2014 | 5,978 | 428,475 | (61,037) | 1,974,146 | (93,526) | 10,877 |
Excess (deficit) of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 3,530 |  |  |  |  |
Tax benefit (expense) realized from equity compensation plans |  | 964 |  |  |  |  | 964
Issuance of restricted stock, net of forfeitures |  | (9,290) |  |  |  |  |
Amortization of unearned compensation |  | 11,104 |  |  |  |  |
Acquisitions of noncontrolling interests |  | 0 |  |  |  | 0 |
Net earnings attributable to Kirby for the year |  |  |  | 226,684 |  |  | 226,684
Purchase of treasury stock (35,000 in 2016 and 3,316,000 in 2015) |  |  |  |  | (241,105) |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (170,000 in 2016, 166,000 in 2015 and 211,000 in 2014) |  |  |  |  | 6,537 |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 1,286 | 1,286
Return of investment to noncontrolling interests |  |  |  |  |  | (1,778) | 1,778
Other comprehensive income (loss), net of taxes |  |  | 16,351 |  |  |  | 16,351
Balance at end of year at Dec. 31, 2015 | 5,978 | 434,783 | (44,686) | 2,200,830 | (328,094) | 10,385 | 2,279,196
Excess (deficit) of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | (755) |  |  |  |  |
Tax benefit (expense) realized from equity compensation plans |  | (824) |  |  |  |  | (824)
Issuance of restricted stock, net of forfeitures |  | (10,218) |  |  |  |  |
Amortization of unearned compensation |  | 11,675 |  |  |  |  |
Acquisitions of noncontrolling interests |  | (2,202) |  |  |  | (6,258) |
Net earnings attributable to Kirby for the year |  |  |  | 141,406 |  |  | 141,406
Purchase of treasury stock (35,000 in 2016 and 3,316,000 in 2015) |  |  |  |  | (1,827) |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (170,000 in 2016, 166,000 in 2015 and 211,000 in 2014) |  |  |  |  | 9,573 |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 1,398 | 1,398
Return of investment to noncontrolling interests |  |  |  |  |  | (1,976) | 1,976
Other comprehensive income (loss), net of taxes |  |  | (6,321) |  |  |  | (6,321)
Balance at end of year at Dec. 31, 2016 | $ 5,978 | $ 432,459 | $ (51,007) | $ 2,342,236 | $ (320,348) | $ 3,549 | $ 2,412,867

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