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Credit Risk and Fair Value of Financial Instruments Level 3 (Tables)
3 Months Ended
Mar. 31, 2013
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 March 31, 2013 and December 31, 2012 was as follows:
 
March 31, 2013
 
December 31, 2012
 
(In thousands)
7.875% Debentures due February 2013
$

 
$
4,786

6.75% Senior Notes due April 2015
148,713

 
150,112

6.75% Senior Notes due April 2016
218,102

 
222,049

7.0% Senior Notes due June 2017
333,017

 
341,094

7.625% Senior Notes due October 2018
293,750

 
298,750

7.0% Senior Notes due May 2019
271,875

 
276,250

4.5% Senior Notes due November 2020
201,500

 
204,500

8.0% Senior Notes due November 2021
180,000

 
186,000

7.5% Senior Notes due April 2027
223,000

 
215,500

Bank credit facility due March 2016
86,600

 
86,600

Mortgage notes and other debt, maturities through 2047
5,507

 
5,698

Total fair value of debt instruments
$
1,962,064

 
$
1,991,339