CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 4,198	$ 20,102
Accounts receivable:
Trade - less allowance for doubtful accounts	448,281	452,222
Other	116,673	106,231
Inventories - net	384,007	315,729
Prepaid expenses and other current assets	82,173	62,798
Total current assets	1,035,332	957,082
Property and equipment	5,007,375	4,360,882
Less accumulated depreciation	(1,458,309)	(1,401,617)
Property and equipment - net	3,549,066	2,959,265
Goodwill	961,745	935,135
Other intangibles - net	233,974	232,808
Other assets	49,159	43,137
Total assets	5,829,276	5,127,427
Current liabilities:
Bank notes payable	17	3
Income taxes payable	2,875	191
Accounts payable	263,470	222,005
Accrued liabilities	228,791	209,760
Deferred revenues	61,165	48,347
Total current liabilities	556,318	480,306
Long-term debt - less current portion	1,442,513	992,403
Deferred income taxes	531,284	468,451
Other long-term liabilities	111,470	72,044
Total long-term liabilities	2,085,267	1,532,898
Contingencies and commitments
Kirby stockholders' equity:
Common stock, $.10 par value per share. Authorized 120,000,000 shares, issued 65,472,000 shares	6,547	6,547
Additional paid-in capital	817,609	802,961
Accumulated other comprehensive income - net	(39,922)	(32,405)
Retained earnings	2,706,213	2,646,937
Treasury stock - at cost, 5,598,000 shares at June 30, 2018 and 5,783,000 at December 31, 2017	(306,097)	(313,220)
Total Kirby stockholders' equity	3,184,350	3,110,820
Noncontrolling interests	3,341	3,403
Total equity	3,187,691	3,114,223
Total liabilities and equity	$ 5,829,276	$ 5,127,427