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Inventory	3 Months Ended
Inventory	Mar. 31, 2013
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory at March 31, 2013 and December 31, 2012, of $5.1 million and $4.4 million respectively, consists of spare parts and small equipment held for use in the ordinary course of business. Non-current inventory at March 31, 2013 and December 31, 2012 totaled $0.9 million in each period and consisted primarily of spare engines components kept on hand for the Company's dredging assets.

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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