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Credit Risk and Fair Value of Financial Instruments Level 3 (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
The fair value of our debt instruments at December 31 was as follows:
 
2011
 
2010
 
(In thousands)
7.875% Debentures due February 2013
$
4,971

 
$
9,092

7.375% Senior Notes due October 2014
196,954

 
194,244

6.75% Senior Notes due April 2015
150,083

 
161,968

6.75% Senior Notes due April 2016
216,375

 
216,653

7.0% Senior Notes due June 2017
323,025

 
302,375

7.625% Senior Notes due October 2018
276,875

 
262,500

7.0% Senior Notes due May 2019
262,500

 
251,250

8.0% Senior Notes due November 2021
167,550

 
158,063

7.5% Senior Notes due April 2027
195,750

 
194,920

Bank credit facility due March 2016
65,000

 

Mortgage notes and other debt, maturities through 2047
36,340

 
37,991

Total fair value of debt instruments
$
1,895,423

 
$
1,789,056