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Repurchase Of Common Stock (Tables)
6 Months Ended
Jun. 30, 2013
Class of Stock Disclosures [Abstract]  
Schedule of Treasury Stock by Class [Table Text Block]
The following table presents a summary of our authorized stock repurchase balance:
 
Board
Dollars in thousands
Authorization
Authorized repurchase - as of January 1, 2013
$
133,640

Additional board authorization
250,000

Proceeds from the exercise of stock options
10,519

Repurchase of common stock from open market
(71,388
)
Authorized repurchase - as of June 30, 2013
$
322,771