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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Unbilled Contracts Receivable (in dollars)	$ 118,545	$ 131,333
Vessels and other property, construction in progress (in dollars)	107,031	95,283
Vessels and other property, accumulated depreciation (in dollars)	1,025,933	994,306
Intangible Assets, accumulated amortization (in dollars)	32,652	31,356
Income taxes payable ,reserve for uncertain tax positions (in dollars)	$ 326,121	$ 326,121

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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