Repurchases of Common Stock (Tables)

3 Months Ended

Mar. 31, 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	339
Repurchase of common stock from open market	(40,708		)
Authorized repurchase - as of March 31, 2015	$	373,286