CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 4,826	$ 5,634
Accounts receivable:
Trade - less allowance for doubtful accounts	433,295	297,177
Other	77,913	95,327
Inventories - net	323,403	185,402
Prepaid expenses and other current assets	51,327	49,411
Total current assets	890,764	632,951
Property and equipment	4,583,442	4,328,897
Less accumulated depreciation	(1,487,332)	(1,407,523)
Property and equipment - net	3,096,110	2,921,374
Goodwill	919,276	598,131
Other assets	294,265	137,439
Total assets	5,200,415	4,289,895
Current liabilities:
Current portion of long-term debt	1,501	0
Bank notes payable	899	0
Income taxes payable	1,434	3,288
Accounts payable	214,109	134,571
Accrued liabilities	203,826	184,478
Deferred revenues	40,421	36,001
Total current liabilities	462,190	358,338
Long-term debt - less current portion	1,031,028	722,802
Deferred income taxes	756,268	705,453
Other long-term liabilities	74,801	90,435
Total long-term liabilities	1,862,097	1,518,690
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	5,978
Additional paid-in capital	799,714	432,459
Accumulated other comprehensive income - net	(35,778)	(51,007)
Retained earnings	2,415,618	2,342,236
Treasury stock - at cost, 5,784,000 shares at September 30, 2017 and 5,921,000 at December 31, 2016	(313,423)	(320,348)
Total Kirby stockholders' equity	2,872,678	2,409,318
Noncontrolling interests	3,450	3,549
Total equity	2,876,128	2,412,867
Total liabilities and equity	$ 5,200,415	$ 4,289,895

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.