Debt (Tables)

Dec. 31, 2011

Debt [Abstract]

ComponentsOfDebt

	2011		2010
	(in thousands)
Short-term debt:
7.15% Senior Notes due 2018	$                1,200	$                1,200
Total short-term debt	1,200	1,200
Long-term debt:
Variable rate (2.276% at December 31, 2011 and 0.887% at December 31, 2010) unsecured revolving credit facility, expires February 2016	671,500	421,200
7.5% Senior Notes due 2018	600,000	600,000
7.35% Senior Notes due 2017	15,000	15,000
7.125% Senior Notes due 2017	25,000	25,000
7.15% Senior Notes due 2018	30,600	31,800
	1,342,100	1,093,000
Total debt	$        1,343,300	$        1,094,200

Schedule Of Long Term Debt Maturities

The following is a summary of scheduled long-term debt maturities by year as of December 31, 2011 (in thousands):

2012	$                1,200
2013	1,200
2014	1,200
2015	1,200
2016	672,700
Thereafter	665,800
	$       1,343,300