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Long-Term Debt Long-Term Debt - Notes (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
7.75% Senior Subordinated Notes Due 2022
Dec. 31, 2011
7.75% Senior Subordinated Notes Due 2022
May 06, 2010
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2012
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2011
8.75% Senior Subordinated Notes due 2020
Aug. 31, 2009
8.625% Senior Notes Due 2017
Dec. 31, 2012
8.625% Senior Notes Due 2017
Dec. 31, 2011
8.625% Senior Notes Due 2017
May 06, 2010
8.625% Senior Notes Due 2017
Dec. 31, 2012
Senior Secured Credit Facility
Dec. 31, 2011
Senior Secured Credit Facility
Dec. 31, 2012
7.50% Senior Subordinated Notes due 2015
Dec. 31, 2011
7.50% Senior Subordinated Notes due 2015
Jun. 30, 2007
7.50% Senior Subordinated Notes due 2015
Dec. 31, 2012
8.25% Senior Subordinated Notes due 2012
Dec. 31, 2012
Credit Spread Option
Dec. 31, 2012
On or after August 1 2013
8.625% Senior Notes Due 2017
Dec. 31, 2012
On or after May 15 2015
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2012
On or after April 1 2017
7.75% Senior Subordinated Notes Due 2022
Dec. 31, 2012
On or after August 1 2014
8.625% Senior Notes Due 2017
Dec. 31, 2012
On or after May 15 2016
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2012
On or after April 1 2018
7.75% Senior Subordinated Notes Due 2022
Dec. 31, 2012
On or after August 1 2015 and thereafter
8.625% Senior Notes Due 2017
Dec. 31, 2012
On or after May 15 2017
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2012
On or after April 1 2019
7.75% Senior Subordinated Notes Due 2022
Dec. 31, 2012
On or after May 15 2018 and thereafter
8.75% Senior Subordinated Notes due 2020
Dec. 31, 2012
On or after April 1 2020 and thereafter
7.75% Senior Subordinated Notes Due 2022
Dec. 31, 2012
Minimum
Base Rate
Senior Secured Credit Facility
Long-term Debt                                                              
Stated percentage       7.75%   8.75% 8.75%   8.625%               7.50% 8.25%                          
Long-term Debt $ 1,440,500,000 $ 1,224,000,000   $ 325,000,000 $ 0   $ 350,000,000 $ 350,000,000   $ 445,800,000 $ 445,100,000   $ 0 $ 56,000,000 $ 0 $ 372,200,000                              
Debt Instrument, Face Amount       325,000,000         450,000,000           385,000,000                                
Proceeds from Issuance of Long-term Debt 646,750,000 0 350,000,000 318,000,000   341,500,000     434,000,000                                            
Repayments of Long-term Debt 391,500,000 10,104,000 200,008,000                   70,000,000   407,000,000                                
Percentage of par increasing yield rate                       98.597%                                      
Interest Yield Rate                       8.875%                                      
Senior indebtedness and secured indebtedness limit             1,500,000,000     750,000,000                                          
Consolidated EBITDA Multiple             2.5     3.5                                          
Basis Spread on Interest Rate                                     0.50%                       0.25%
Maximum consolidated total assets 250,000,000                                                            
Percent of consolidated total assets 5.00%                                                            
Consolidated coverage ratio 2.00                                                            
Note redeemable at a percentage of par                             103.75%         104.313% 104.375% 103.875% 102.156% 102.917% 102.583% 100.00% 101.458% 101.292% 100.00% 100.00%  
Early Repayment of Senior Debt                             10,000,000                                
Loss on early extinguishment of debt $ (20,718,000) $ (183,000) $ (1,852,000)