Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 394,783	$ 248,204
Restricted cash	16,776	28,285
Marketable securities	27,264	21,668
Receivables:
Trade, net of allowance for doubtful accounts	188,128	224,944
Other Receivables	37,204	45,334
Inventories	22,955	25,787
Deferred income taxes	3,530	3,530
Prepaid expenses and other	11,715	12,719
Discontinued operations	0	108,153
Total current assets	702,355	718,624
Property and Equipment:
Property, Plant and Equipment, Gross	2,212,929	2,238,383
Accumulated depreciation	806,672	763,803
Property, Plant and Equipment, Net In Service	1,406,257	1,474,580
Construction in Progress, Gross	133,985	110,296
Net property and equipment	1,540,242	1,584,876
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	293,793	272,535
Construction Reserve Funds & Title XI Reserve Funds	150,375	195,629
Goodwill	17,978	17,978
Intangible Assets, Net	14,594	15,305
Other Assets	48,996	55,123
Discontinued Operations	0	840,724
Total assets	2,768,333	3,700,794
Current Liabilities:
Current portion of long-term debt	25,109	21,920
Current portion of capital lease obligations	10	2,900
Accounts payable and accrued expenses	73,185	107,892
Other current liabilities	122,424	93,093
Discontinued operations	0	39,836
Total current liabilities	220,728	265,641
Long-Term Debt	674,444	655,309
Capital Lease Obligations	24	59
Deferred Income Taxes	421,623	426,027
Deferred Gains and Other Liabilities	115,078	120,342
Discontinued Operations	0	490,741
Total liabilities	1,431,897	1,958,119
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; 36,603,406 and 36,444,439 shares issued in 2012 and 2011, respectively	370	367
Additional paid-in capital	1,347,909	1,330,324
Retained earnings	1,056,583	1,473,509
Treasury Stock, Value	1,089,061	1,088,560
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,243)	(1,986)
Stockholders' equity attributable to parent, total	1,311,558	1,713,654
Noncontrolling interests in subsidiaries	24,878	29,021
Total equity	1,336,436	1,742,675
Liabilities and stockholders' equity, total	$ 2,768,333	$ 3,700,794