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Long-Term Debt (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
4.25% convertible senior notes due June 2014
Dec. 31, 2011
4.25% convertible senior notes due June 2014
Jun. 30, 2009
4.25% convertible senior notes due June 2014
Dec. 31, 2012
4.75% convertible senior notes due January 2014
Dec. 31, 2011
4.75% convertible senior notes due January 2014
Dec. 31, 2003
4.75% convertible senior notes due January 2014
Dec. 31, 2012
7.25% senior notes due December 2018
Dec. 31, 2011
7.25% senior notes due December 2018
Nov. 30, 2010
7.25% senior notes due December 2018
Dec. 31, 2011
Other, interest at various rates, collateralized by equipment and other assets
Dec. 31, 2012
Revolving credit facility due July 2016
Dec. 31, 2011
Revolving credit facility due July 2016
Dec. 31, 2012
Partnership's revolving credit facility due November 2015
Dec. 31, 2011
Partnership's revolving credit facility due November 2015
Dec. 31, 2012
Partnership's term loan facility due November 2015
Dec. 31, 2011
Partnership's term loan facility due November 2015
Long-term Debt                                    
Long-term debt $ 1,564,923,000 $ 1,773,039,000 $ 320,673,000 $ 300,149,000   $ 143,750,000 $ 143,750,000   $ 350,000,000 $ 350,000,000   $ 140,000 $ 70,000,000 $ 433,500,000 $ 530,500,000 $ 395,500,000 $ 150,000,000 $ 150,000,000
Interest rate (as a percent)     4.25%   4.25% 4.75%   4.75% 7.25%   7.25%              
Amount of unamortized discount of notes     $ 34,300,000 $ 54,900,000 $ 97,900,000