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Other Employee Benefit Programs (Tables)
 12 Months Ended
Dec. 31, 2015
Employee Benefits and Share-based Compensation [Abstract]  
Defined Contribution Plan Disclosures
Company contributions to defined contribution plans in total for the years ended December 31, 2015, 2014 and 2013 were as follows (dollars in thousands):
 
 
2015
 
2014
 
2013
Company contributions to defined contribution plans
 
$
9,532

 
$
10,400

 
$
9,460