Annual report pursuant to Section 13 and 15(d)

Benefit Plan (Tables)

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Benefit Plan (Tables)
12 Months Ended
Dec. 31, 2012
Benefit Plan [Abstract]  
Component of voluntary employer matching contributions
                         
    Year ended December 31,  
        2012             2011             2010      

Voluntary employer matching contributions

    $         660       $         474       $         427