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Long-Term Debt (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 30, 2012
Feb. 09, 2012
Jun. 30, 2012
September 30, 2012 - December 31, 2012 [Member]
Jun. 30, 2012
March 31, 2013 - March 31, 2014 [Member]
Jun. 30, 2012
June 30, 2014 - December 31, 2014 [Member]
Jun. 30, 2012
March 31, 2015 [Member]
Jun. 30, 2012
June 30, 2015 - September 30, 2015 [Member]
Jun. 30, 2012
December 31, 2015 [Member]
Jun. 30, 2012
March 31, 2016 - September 30, 2016 [Member]
Jun. 30, 2012
December 31, 2016 [Member]
Jun. 30, 2012
March 31, 2017 - June 30, 2017 [Member]
Jun. 30, 2012
August 9, 2017 [Member]
Jun. 30, 2012
Senior Credit Facility [Member]
Feb. 09, 2012
Senior Credit Facility [Member]
Apr. 30, 2010
7 7/8% Senior Subordinated Notes [Member]
Jun. 30, 2012
7 7/8% Senior Subordinated Notes [Member]
Jun. 30, 2011
7 7/8% Senior Subordinated Notes [Member]
Apr. 22, 2010
7 7/8% Senior Subordinated Notes [Member]
Jun. 30, 2012
Revolving Credit Facility [Member]
Feb. 09, 2012
Revolving Credit Facility [Member]
Jun. 30, 2012
6 5/8% Senior Subordinated Notes [Member]
Feb. 27, 2012
6 5/8% Senior Subordinated Notes [Member]
Feb. 09, 2012
6 5/8% Senior Subordinated Notes [Member]
Jan. 26, 2012
6 5/8% Senior Subordinated Notes [Member]
Jun. 30, 2011
6 5/8% Senior Subordinated Notes [Member]
Aug. 16, 2005
6 5/8% Senior Subordinated Notes [Member]
Jun. 30, 2012
6 5/8% Senior Subordinated Notes - Series B [Member]
Jun. 30, 2011
6 5/8% Senior Subordinated Notes - Series B [Member]
Aug. 17, 2006
6 5/8% Senior Subordinated Notes - Series B [Member]
Jun. 30, 2012
6 5/8% Senior Subordinated Notes - Series C [Member]
Jun. 30, 2011
6 5/8% Senior Subordinated Notes - Series C [Member]
Oct. 11, 2007
6 5/8% Senior Subordinated Notes - Series C [Member]
Feb. 29, 2012
5 7/8% Senior Subordinated Notes [Member]
Jun. 30, 2012
5 7/8% Senior Subordinated Notes [Member]
Feb. 09, 2012
5 7/8% Senior Subordinated Notes [Member]
Jun. 30, 2011
5 7/8% Senior Subordinated Notes [Member]
Mar. 31, 2009
9 3/4% Senior Notes [Member]
Jun. 30, 2012
9 3/4% Senior Notes [Member]
Jun. 30, 2011
9 3/4% Senior Notes [Member]
Mar. 27, 2009
9 3/4% Senior Notes [Member]
Feb. 09, 2012
Term Loan A 1 Facility [Member]
Feb. 09, 2012
Term Loan A 2 Facility [Member]
Feb. 09, 2012
Term Loan A 3 Facility [Member]
Feb. 09, 2012
Term B Facility [Member]
Feb. 09, 2012
Incremental Facility [Member]
Long-term Debt Type (Textual) [Abstract]                                                                                                
Principal payment date           2012-09-30 – 2012-12-31 2013-03-31 – 2014-03-31 2014-06-30 – 2014-12-31 2015-03-31 2015-06-30 – 2015-09-30 2015-12-31 2016-03-31 – 2016-09-30 2016-12-31 2017-03-31 – 2017-06-30 2017-08-09                                                                  
Interest rate on senior notes       6.625%                             7.875% 7.875% 7.875%     6.625%       6.625% 6.625% 6.625% 6.625% 6.625% 6.625% 6.625% 6.625%   5.875% 5.875% 5.875%   9.75% 9.75% 9.75%          
Aggregate principal amount of Debt issued   $ 2,208,060                                     $ 400,000               $ 400,000     $ 216,000     $ 275,000     $ 500,000         $ 350,000          
Tender offer amount                                                     700,000                                          
Tender accepted amount                                                   483,655                                            
Repurchase tendered amount                                                   582,903                                            
Repurchase previous tender accepted amount                                                 99,248                                              
Previous tendered amount                                                 220                                              
Loss on extinguishment of debt    (29,972)                                            29,972                                                
Gross proceeds from the issuance of debt                                                                               314,927                
Net proceeds from the issuance of debt                                   392,000                                   489,000       307,489                
Redemption percentage of aggregate principal amount of senior notes                                   35.00%                                   35.00%                        
Redemption percentage equal to principal amount include aggregate premium                                   100.00%                                   100.00%       100.00%                
Additional redeemed percentage of aggregate principal amount                                   107.875%                                   105.875%                        
Redemption price percentage of the principal amount to be purchased                                                                       101.00%       101.00%                
Maximum borrowing limit of incremental loan facility                                 100,000           250,000                                         270,000 30,000 100,000 575,000 300,000
Line of credit facility maximum borrowing capacity available to subsidiaries                                                                                               110,000
Redemption percentage of issued notes which remain outstanding                                   65.00%                                   65.00%                        
Letter of credit outstanding                                           8,334                                                    
Remaining borrowing capacity under revolving credit facility   241,666                                                                                            
Ratio of indebtedness to net capital minimum                               1.00                                                                
Ratio of indebtedness to net capital one                               5.00                                                                
Additional Long-term Debt (Textual) [Abstract]                                                                                                
Aggregate cash payment in connection with tender offer   613,887                                                                                            
Description of Interest Computation   360-day year comprised of twelve 30-day months                                                                                            
Balance outstanding under revolving credit facility   0                                                                                            
Additional Senior credit facility         $ 200,000                                                                                      
Senior debt ratio         3.25                                                                                      
Reduced percentage of consolidated excess cash flow to repay outstanding loan two   0.00%