Repurchases of Common Stock (Tables)

6 Months Ended

Jun. 30, 2015

Class of Stock Disclosures [Abstract]

Authorized stock repurchase balance

The following table presents a summary of our authorized stock repurchase balance:

Dollars in thousands	Board Authorization
Authorized repurchase - as of January 1, 2015	$	163,655
Additional board authorization	250,000
Proceeds from the exercise of stock options	2,498
Repurchase of common stock from open market	(62,731		)
Authorized repurchase - as of June 30, 2015	$	353,422