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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
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption | ASU 2016-09 [Member] |  |  |  | $ 0 |  |  |
Cumulative effect of adoption | ASU 2014-09 [Member] |  |  |  | 0 |  |  |
Cumulative effect of adoption | ASU 2018-02 [Member] |  |  | $ 0 | 0 |  |  |
Balance at beginning of year at Dec. 31, 2015 | $ 5,978 | $ 434,783 | (44,686) | 2,200,830 | $ (328,094) | $ 10,385 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of shares in acquisition | 0 | 0 |  |  |  |  |
(Deficit) of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | (755) |  |  |  |  |
Tax expense realized from equity compensation plans |  | (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 (11,000 in 2018 and 35,000 in 2016) |  |  |  |  | (1,827) |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016) |  |  |  |  | 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 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption | ASU 2016-09 [Member] |  |  |  | (8,486) |  |  |
Cumulative effect of adoption | ASU 2014-09 [Member] |  |  |  | 0 |  |  |
Cumulative effect of adoption | ASU 2018-02 [Member] |  |  | 0 | 0 |  |  |
Issuance of shares in acquisition | 569 | 365,985 |  |  |  |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 833 |  |  |  |  |
Tax expense realized from equity compensation plans |  | 0 |  |  |  |  |
Issuance of restricted stock, net of forfeitures |  | (7,770) |  |  |  |  |
Amortization of unearned compensation |  | 11,460 |  |  |  |  |
Acquisitions of noncontrolling interests |  | (6) |  |  |  | 0 |
Net earnings attributable to Kirby for the year |  |  |  | 313,187 |  |  | 313,187
Purchase of treasury stock (11,000 in 2018 and 35,000 in 2016) |  |  |  |  | 0 |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016) |  |  |  |  | 7,128 |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 716 | 716
Return of investment to noncontrolling interests |  |  |  |  |  | (862) | 862
Other comprehensive income (loss), net of taxes |  |  | 18,602 |  |  |  | 18,602
Balance at end of year at Dec. 31, 2017 | 6,547 | 802,961 | (32,405) | 2,646,937 | (313,220) | 3,403 | 3,114,223
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption | ASU 2016-09 [Member] |  |  |  | 0 |  |  |
Cumulative effect of adoption | ASU 2014-09 [Member] |  |  |  | (9,722) |  |  |
Cumulative effect of adoption | ASU 2018-02 [Member] |  |  | (7,925) | 7,925 |  |  |
Issuance of shares in acquisition | 0 | 0 |  |  |  |  |
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued |  | 3,489 |  |  |  |  |
Tax expense realized from equity compensation plans |  | 0 |  |  |  |  |
Issuance of restricted stock, net of forfeitures |  | (2,207) |  |  |  |  |
Amortization of unearned compensation |  | 19,104 |  |  |  |  |
Acquisitions of noncontrolling interests |  | 0 |  |  |  | 0 |
Net earnings attributable to Kirby for the year |  |  |  | 78,452 |  |  | 78,452
Purchase of treasury stock (11,000 in 2018 and 35,000 in 2016) |  |  |  |  | (776) |  |
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016) |  |  |  |  | 7,208 |  |
Net earnings attributable to noncontrolling interests |  |  |  |  |  | 626 | 626
Return of investment to noncontrolling interests |  |  |  |  |  | (915) | 915
Other comprehensive income (loss), net of taxes |  |  | 6,819 |  |  |  | (1,106)
Balance at end of year at Dec. 31, 2018 | $ 6,547 | $ 823,347 | $ (33,511) | 2,723,592 | $ (306,788) | $ 3,114 | 3,216,301
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption | ASU 2014-09 [Member] |  |  |  | $ 9,722 |  |  | $ 9,722

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