TAXES (Components of Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax liabilities:
Vessels and other property	$ 133,347	$ 227,846
Prepaid expenditures	7,236	13,553
Other—net	6	885
Total deferred tax liabilities	140,589	242,284
Deferred tax assets:
Loss carryforwards	53,006	88,370
Employee compensation and benefit plans	5,507	12,232
Financing and professional fees	268	977
Accrued expenses and other	5,762	5,873
Total deferred tax assets	64,543	107,452
Valuation allowance	7,625	6,625
Net deferred tax assets	56,918	100,827
Net deferred tax liabilities	$ 83,671	$ 141,457