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Employee Benefit Plan Employee Benefit Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plan Contributions
We made matching contributions as follows (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
401(k) matching contributions
$
2,485

 
$
2,413

 
$
2,196