CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 7,010	$ 20,102
Accounts receivable:
Trade - less allowance for doubtful accounts	485,865	452,222
Other	110,640	106,231
Inventories - net	372,182	315,729
Prepaid expenses and other current assets	80,957	62,798
Total current assets	1,056,654	957,082
Property and equipment	4,860,841	4,360,882
Less accumulated depreciation	(1,416,973)	(1,401,617)
Property and equipment - net	3,443,868	2,959,265
Goodwill	935,755	935,135
Other intangibles, net	228,015	232,808
Other assets	50,208	43,137
Total assets	5,714,500	5,127,427
Current liabilities:
Bank notes payable	27	3
Income taxes payable	1,936	191
Accounts payable	251,916	222,005
Accrued liabilities	196,063	209,760
Deferred revenues	81,216	48,347
Total current liabilities	531,158	480,306
Long-term debt - less current portion	1,423,267	992,403
Deferred income taxes	517,421	468,451
Other long-term liabilities	100,786	72,044
Total long-term liabilities	2,041,474	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	810,381	802,961
Accumulated other comprehensive income - net	(39,480)	(32,405)
Retained earnings	2,677,611	2,646,937
Treasury stock - at cost, 5,800,000 shares at March 31, 2018 and 5,783,000 at December 31, 2017	(316,564)	(313,220)
Total Kirby stockholders' equity	3,138,495	3,110,820
Noncontrolling interests	3,373	3,403
Total equity	3,141,868	3,114,223
Total liabilities and equity	$ 5,714,500	$ 5,127,427

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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Namespace Prefix:	us-gaap_
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.