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Stockholder's Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Treasury Stock Activity
The following represents the activity relating to the treasury stock held by the Company during the six months ended June 30, 2017:
 
Treasury stock shares
 
Cost
(dollars in thousands)
 
Average cost per share
Balance outstanding at December 31, 2016
9,810,802

 
$
153,845

 
$
15.68

Shares purchased for minimum tax withholding under the Equity Plan or other similar transactions
782,389

 
11,279

 
14.42

Purchase of treasury stock
—

 
—

 
—

Balance outstanding at June 30, 2017
10,593,191

 
$
165,124

 
$
15.59