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Research And Development	12 Months Ended
	Dec. 31, 2011
Research And Development [Abstract]
Research And Development	(10) Research and Development Research and development expenses which are included in operating expenses were $6,555, $5,876 and $4,876 for the years ended December 31, 2011, 2010 and 2009.

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Research and Development expenses which are included in operating expenses.

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