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Changes In Accounting Estimates (Narrative) (Details)	6 Months Ended
Changes In Accounting Estimates (Narrative) (Details)	Jun. 30, 2013
Accounting Changes and Error Corrections [Abstract]
Reduction in net income from a change in estimates in construction contracts	0.7

Disclosure of the effect on income from continuing operations, net income (or other appropriate captions of changes in applicable net assets or performance indicator), and any related per-share amounts of the current period when a change in accounting estimate affects several future periods.

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