Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details Textual)

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Property and Equipment (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property and Equipment (Textual) [Abstract]      
Interest capitalized in conjunction with construction projects $ 1.2 $ 2.3 $ 2.3
Commitments for facility construction projects $ 44.8