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Inventories	6 Months Ended
Inventories	Jun. 30, 2011
Inventories [Abstract]
Inventories	(6) Inventories Total inventories were $52.5 million at June 30, 2011 and $56.2 million at December 31, 2010. Substantially all of the company's inventory consisted of component parts, raw materials and milestone payments for future delivery of component parts. The company had no significant allowances for obsolete inventory as of June 30, 2011 and December 31, 2010.

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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