CONDENSED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 6,482	$ 11,059
Accounts receivable:
Trade - less allowance for doubtful accounts	308,495	313,182
Other	32,265	43,074
Inventories - net	138,439	177,397
Prepaid expenses and other current assets	39,511	39,248
Deferred income taxes	9,991	12,296
Total current assets	535,183	596,256
Property and equipment	3,340,165	3,219,113
Less accumulated depreciation	(973,117)	(903,948)
Property and equipment - net	2,367,048	2,315,165
Goodwill	591,362	596,030
Other assets	167,719	145,677
Total assets	3,661,312	3,653,128
Current liabilities:
Current portion of long-term debt	0	65,000
Income taxes payable	11,391	2,369
Accounts payable	156,260	156,763
Accrued liabilities	121,728	114,031
Deferred revenues	35,872	16,857
Total current liabilities	325,251	355,020
Long-term debt - less current portion	860,930	1,070,110
Deferred income taxes	485,018	426,096
Other long-term liabilities	77,858	94,848
Total long-term liabilities	1,423,806	1,591,054
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	406,427	397,785
Accumulated other comprehensive income - net	(57,188)	(61,127)
Retained earnings	1,627,873	1,439,079
Treasury stock - at cost, 2,965,000 at September 30, 2013 and 3,191,000 at December 31, 2012	(82,203)	(86,747)
Total Kirby stockholders' equity	1,900,887	1,694,968
Noncontrolling interests	11,368	12,086
Total equity	1,912,255	1,707,054
Total liabilities and equity	$ 3,661,312	$ 3,653,128