CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 4,491	$ 24,299
Accounts receivable:
Trade - less allowance for doubtful accounts	373,916	417,325
Other	98,496	115,598
Inventories - net	195,729	192,354
Prepaid expenses and other current assets	39,097	43,016
Deferred income taxes	11,831	10,562
Total current assets	723,560	803,154
Property and equipment	3,853,292	3,717,398
Less accumulated depreciation	(1,170,260)	(1,127,900)
Property and equipment - net	2,683,032	2,589,498
Goodwill	591,405	591,405
Other assets	153,897	157,852
Total assets	4,151,894	4,141,909
Current liabilities:
Current portion of long-term debt	0	116,700
Income taxes payable	14,894	3,470
Accounts payable	166,629	222,020
Accrued liabilities	181,019	201,033
Deferred revenues	47,540	50,804
Total current liabilities	410,082	594,027
Long-term debt - less current portion	818,900	600,000
Other long-term liabilities	88,084	87,200
Total long-term liabilities	1,511,891	1,282,969
Contingencies and commitments
Deferred income taxes	604,907	595,769
Kirby stockholders' equity:
Common stock, $.10 par value per share. Authorized 120,000,000 shares, issued 59,776,000 shares	5,978	5,978
Additional paid-in capital	426,648	428,475
Accumulated other comprehensive income - net	(60,026)	(61,037)
Retained earnings	2,035,224	1,974,146
Treasury stock - at cost, 4,067,000 shares at March 31, 2015 and 2,906,000 at December 31, 2014	(188,704)	(93,526)
Total Kirby stockholders' equity	2,219,120	2,254,036
Noncontrolling interests	10,801	10,877
Total equity	2,229,921	2,264,913
Total liabilities and equity	$ 4,151,894	$ 4,141,909