Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt [Abstract]

Summary Of Long-Term Debt

	2012	2011
Revolving credit facility - interest payable monthly at floating
rate, due December 2017	$               -	$      75,000
Term loan - interest payable monthly at floating rate and
principal payable quarterly, due December 2017	385,000	-
U.S. Government guaranteed long-term financing - interest
payable semiannually at 6.45%, due in semiannual
installments through June 2027	-	12,546
Senior Notes - interest payable semiannually at 6 7/8%,
due June 2014	150,000	300,000
Discount on 6 7/8% Senior Notes	(500)	(1,649)
Senior Notes - interest payable semiannually at 6 3/8%,
due May 2019	500,000	500,000
Senior Notes - interest payable semiannually at 7 1/8%,
due December 2021	800,000	800,000
	1,834,500	1,685,897
Less current portion	20,000	810
Long-term debt	$ 1,814,500	$ 1,685,087

Schedule Of Maturities Of Long-Term Debt

2013	$       20,000
2014	170,000
2015	20,000
2016	20,000
2017	305,000
Thereafter	1,300,000
Total	$  1,835,000