Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 223,154	$ 256,638
Restricted cash	2,260	2,249
Marketable securities	75,071	76,137
Receivables:
Trade, net of allowance for doubtful accounts of $9,935 and $8,347 in 2017 and 2016, respectively	59,772	108,641
Other Receivables	35,704	35,482
Inventories	2,444	2,582
Prepaid expenses and other	4,814	3,707
Discontinued operations	23,105	277,365
Total current assets	426,324	762,801
Property and Equipment:
Property, Plant and Equipment, Gross	1,340,400	1,178,556
Accumulated depreciation	467,925	444,559
Property, Plant and Equipment, Other, Net in Service	872,475	733,997
Construction in progress	133,537	246,010
Net property and equipment	1,006,012	980,007
Investments, at Equity, and Advances to 50% or Less Owned Companies	174,106	175,461
Construction Reserve Funds	65,429	75,753
Goodwill	32,749	32,758
Intangible Assets, Net	18,931	20,078
Other Assets	17,739	17,189
Discontinued Operations	32,595	798,274
Total assets	1,773,885	2,862,321
Current Liabilities:
Current portion of long-term debt	125,655	163,202
Accounts payable and accrued expenses	32,437	59,563
Other current liabilities	49,602	62,164
Discontinued operations	6,324	85,020
Total current liabilities	214,018	369,949
Long-Term Debt	615,532	631,084
Exchange Option Liability on Subsidiary Convertible Senior Notes	0	19,436
Deferred Income Taxes	161,185	157,441
Deferred Gains and Other Liabilities	97,245	98,098
Discontinued Operations	7,681	390,045
Total liabilities	1,095,661	1,666,053
SEACOR Holdings Inc. stockholders’ equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued nor outstanding	0	0
Common stock, $.01 par value, 60,000,000 shares authorized; 38,039,909 and 37,939,032 shares issued in 2017 and 2016, respectively	382	379
Additional paid-in capital	1,547,936	1,518,635
Retained earnings	360,139	910,723
Shares held in treasury of 20,634,001 and 20,538,327 in 2017 and 2016, respectively, at cost	1,364,273	1,357,331
Accumulated other comprehensive loss, net of tax	(545)	(11,514)
Stockholders' equity attributable to parent, total	543,639	1,060,892
Noncontrolling interests in subsidiaries	134,585	135,376
Total equity	678,224	1,196,268
Liabilities and stockholders' equity, total	$ 1,773,885	$ 2,862,321

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
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.