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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
We recognized expense associated with matching contributions as follows (in thousands):
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
401(k) expense
 
$
805

 
$
882

 
$
817