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Fair value (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Fair value and carrying value of debt instruments
The fair values and carrying values of our debt instruments are detailed as follows:
 
June 30, 2012
 
December 31, 2011
 
Fair Value
 
Carrying
Value
 
Fair Value
 
Carrying
Value
7.20% senior notes, payable April 15, 2012 interest payable semiannually
$

 

 
336,606

 
336,270

6.125% notes, payable January 15, 2016 interest payable semiannually
989,100

 
900,000

 
963,900

 
900,000

Five-year senior secured credit facility, due July 8, 2016
676,125

 
676,125

 
298,000

 
298,000

Industrial revenue bonds, capital leases and other
51,563

 
51,563

 
52,169

 
52,169

Total long-term debt
1,716,788

 
1,627,688

 
1,650,675

 
1,586,439

Less current portion
57,158

 
57,158

 
386,591

 
386,255

Long-term debt, less current portion
$
1,659,630

 
1,570,530

 
1,264,084

 
1,200,184