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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Postemployment Benefits [Abstract]  
Benefit Costs Recognized as Expense under Plans

Benefit costs recognized as expense under these plans consisted of the following for the years ended December 31:

 

 

 

2017

 

 

2016

 

 

2015

 

Contributions:

 

 

 

 

 

 

 

 

 

 

 

 

Profit sharing

 

$

—

 

 

$

—

 

 

$

—

 

Savings

 

 

953

 

 

 

939

 

 

 

1,547

 

 

 

$

953

 

 

$

939

 

 

$

1,547