CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,859	$ 5,885
Accounts receivable:
Trade - less allowance for doubtful accounts	271,698	290,931
Other	88,477	102,443
Inventories - net	187,717	184,511
Prepaid expenses and other current assets	58,480	45,283
Deferred income taxes	11,302	11,723
Total current assets	620,533	640,776
Property and equipment	4,259,895	4,059,763
Less accumulated depreciation	(1,342,645)	(1,280,783)
Property and equipment - net	2,917,250	2,778,980
Goodwill	587,703	586,718
Other assets	143,329	145,807
Total assets	4,268,815	4,152,281
Current liabilities:
Income taxes payable	3,173	3,564
Accounts payable	134,480	132,799
Accrued liabilities	173,039	184,254
Deferred revenues	33,757	41,300
Total current liabilities	344,449	361,917
Long-term debt - less current portion	798,687	774,849
Deferred income taxes	697,517	669,808
Other long-term liabilities	77,483	66,511
Total long-term liabilities	1,573,687	1,511,168
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	427,173	434,783
Accumulated other comprehensive income - net	(47,186)	(44,686)
Retained earnings	2,277,871	2,200,830
Treasury stock - at cost, 5,920,000 shares at June 30, 2016 and 6,056,000 at December 31, 2015	(320,301)	(328,094)
Total Kirby stockholders' equity	2,343,535	2,268,811
Noncontrolling interests	7,144	10,385
Total equity	2,350,679	2,279,196
Total liabilities and equity	$ 4,268,815	$ 4,152,281

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.