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401(k) Savings Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Defined Contribution Plan, Schedule Of Matching Contributions Our matching contributions for the savings plan were as follows (in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
401(k) matching contributions
$
1,056

 
$
1,014

 
$
746