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Other Employee Benefit Programs (Tables)
 12 Months Ended
Dec. 31, 2017
Employee Benefits and Share-based Compensation, Noncash [Abstract]  
Defined Contribution Plan Disclosures
Company contributions to defined contribution plans in total for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in thousands):
 
 
2017
 
2016
 
2015
Company contributions to defined contribution plans
 
$
11,231

 
$
9,521

 
$
9,532