Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Employee Benefit Plans [Abstract]

Matching contributions

The table below sets forth our matching contributions for the past three years (in thousands):

		2011		2010		2009
Matching contributions - 401(k)	$	4,015	$	3,600	$	3,421
Matching contributions - deferred compensation plan		59		18		16