Senior Notes (Tables)

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Schedule of Carrying Amount of Senior Notes

The following table sets forth the carrying amount of our senior notes as of June 30, 2013 and December 31, 2012, net of applicable discounts:

	June 30,		December 31,
	2013		2012
	(Dollars in thousands)
5.375% Senior Notes due 2014	$	249,716	$	249,621
5.375% Senior Notes due 2015		249,915		249,895
5.625% Senior Notes due 2020		245,594		245,326
6.000% Senior Notes due 2043		350,000		—
Total	$	1,095,225	$	744,842