CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 19,244	$ 4,022
Accounts receivable:
Trade - less allowance for doubtful accounts	326,760	311,549
Other	131,126	43,053
Inventories - net	122,009	135,887
Prepaid expenses and other current assets	47,391	40,037
Deferred income taxes	8,445	9,458
Total current assets	654,975	544,006
Property and equipment	3,434,944	3,375,893
Less accumulated depreciation	(1,041,168)	(1,005,090)
Property and equipment - net	2,393,776	2,370,803
Goodwill	591,405	591,405
Other assets	165,548	176,303
Total assets	3,805,704	3,682,517
Current liabilities:
Income taxes payable	15,441	2,915
Accounts payable	168,337	177,375
Accrued liabilities	207,425	129,001
Deferred revenues	48,927	36,698
Total current liabilities	440,130	345,989
Long-term debt - less current portion	708,000	749,150
Deferred income taxes	551,956	544,110
Other long-term liabilities	14,707	21,115
Total long-term liabilities	1,274,663	1,314,375
Contingencies and commitments
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	416,869	410,615
Accumulated other comprehensive income - net	(16,702)	(16,793)
Retained earnings	1,754,386	1,692,140
Treasury stock - at cost, 2,804,000 shares at March 31, 2014 and 2,930,000 at December 31, 2013	(80,679)	(81,254)
Total Kirby stockholders' equity	2,079,852	2,010,686
Noncontrolling interests	11,059	11,467
Total equity	2,090,911	2,022,153
Total liabilities and equity	$ 3,805,704	$ 3,682,517