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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | 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, 2012 | $ 5,978,000 | $ 397,785,000 | $ (61,127,000) | $ 1,439,079,000 | $ (86,747,000) | $ 12,086,000 |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 8,276,000 |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 3,001,000 |  |  |  |  | $ 3,001,000 |
Issuance of restricted stock, net of forfeitures |  | (10,068,000) |  |  |  |  |  |
Amortization of unearned compensation |  | 11,621,000 |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 253,061,000 |  |  | 253,061,000 |
Purchase of treasury stock (3,316,000 in 2015 and 187,000 in 2014) |  |  |  |  | 0 |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (166,000 in 2015, 211,000 in 2014 and 261,000 in 2013) |  |  |  |  | 5,493,000 |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 3,238,000 | (3,238,000) |
Return of investment to noncontrolling interests |  |  |  |  |  | (3,857,000) | 3,857,000 |
Other comprehensive income (loss), net of taxes |  |  | 44,334,000 |  |  |  | 44,334,000 | [1]
Balance at end of year at Dec. 31, 2013 | 5,978,000 | 410,615,000 | (16,793,000) | 1,692,140,000 | (81,254,000) | 11,467,000 |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 8,345,000 |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 6,119,000 |  |  |  |  | 6,119,000 |
Issuance of restricted stock, net of forfeitures |  | (8,195,000) |  |  |  |  |  |
Amortization of unearned compensation |  | 11,591,000 |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 282,006,000 |  |  | 282,006,000 |
Purchase of treasury stock (3,316,000 in 2015 and 187,000 in 2014) |  |  |  |  | (15,321,000) |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (166,000 in 2015, 211,000 in 2014 and 261,000 in 2013) |  |  |  |  | 3,049,000 |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 2,602,000 | (2,602,000) |
Return of investment to noncontrolling interests |  |  |  |  |  | (3,192,000) | 3,192,000 |
Other comprehensive income (loss), net of taxes |  |  | (44,244,000) |  |  |  | (44,244,000) | [1]
Balance at end of year at Dec. 31, 2014 | 5,978,000 | 428,475,000 | (61,037,000) | 1,974,146,000 | (93,526,000) | 10,877,000 | 2,264,913,000 |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 3,530,000 |  |  |  |  |  |
Tax benefit realized from equity compensation plans |  | 964,000 |  |  |  |  | 964,000 |
Issuance of restricted stock, net of forfeitures |  | (9,290,000) |  |  |  |  |  |
Amortization of unearned compensation |  | 11,104,000 |  |  |  |  |  |
Net earnings attributable to Kirby for the year |  |  |  | 226,684,000 |  |  | 226,684,000 |
Purchase of treasury stock (3,316,000 in 2015 and 187,000 in 2014) |  |  |  |  | (241,105,000) |  |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (166,000 in 2015, 211,000 in 2014 and 261,000 in 2013) |  |  |  |  | 6,537,000 |  |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 1,286,000 | (1,286,000) |
Return of investment to noncontrolling interests |  |  |  |  |  | (1,778,000) | 1,778,000 |
Other comprehensive income (loss), net of taxes |  |  | 16,351,000 |  |  |  | 16,351,000 | [1]
Balance at end of year at Dec. 31, 2015 | $ 5,978,000 | $ 434,783,000 | $ (44,686,000) | $ 2,200,830,000 | $ (328,094,000) | $ 10,385,000 | $ 2,279,196,000 |
[1] | Reclassifications to net earnings of derivatives qualifying as effective hedges are recognized in costs of sales and operating expenses.

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