Debt and Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2013

Debt and Credit Facilities

Schedule of long-term and short-term debt and credit facilities

	MARCH 31,		DECEMBER 31,
(in thousands)	2013		2012
Senior notes
5.4 percent senior notes due January 2015	$	126,481	$	126,481
8.4 percent senior notes due May 2017	230,000		230,000
1.6 percent convertible senior notes due May 2018	225,000		225,000
6.6 percent senior notes due May 2020	300,000		300,000
5.4 percent senior notes due October 2022	250,000		250,000
Total senior notes	1,131,481		1,131,481
Debt discount	(2,846)		(3,000		)
Senior notes, net	1,128,635		1,128,481
Secured notes payable	4,525		5,987
Total debt	$	1,133,160	$	1,134,468