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Long-Term Debt Long-term Debt Instruments (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2013
Secured Debt [Member]
Loans Payable [Member]
Dec. 31, 2012
Secured Debt [Member]
Loans Payable [Member]
Dec. 31, 2013
Secured Debt [Member]
9.25% Notes [Member]
Dec. 31, 2012
Secured Debt [Member]
9.25% Notes [Member]
Dec. 31, 2011
Secured Debt [Member]
9.25% Notes [Member]
Dec. 10, 2009
Secured Debt [Member]
9.25% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
7.875% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
7.875% Notes [Member]
Mar. 01, 2013
Unsecured Debt [Member]
7.875% Notes [Member]
Dec. 31, 2012
Unsecured Debt [Member]
7.875% Notes [Member]
Feb. 27, 2007
Unsecured Debt [Member]
7.875% Notes [Member]
Dec. 31, 2012
Unsecured Debt [Member]
7.75% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
7.75% Notes [Member]
Nov. 03, 2011
Unsecured Debt [Member]
7.75% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
6.625% Notes [Member]
Dec. 31, 2012
Unsecured Debt [Member]
6.625% Notes [Member]
Sep. 17, 2012
Unsecured Debt [Member]
6.625% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
5.25% Notes [Member]
Sep. 18, 2012
Unsecured Debt [Member]
5.25% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
6.25% Notes [Member]
Dec. 31, 2012
Unsecured Debt [Member]
6.25% Notes [Member]
Dec. 31, 2013
Unsecured Debt [Member]
5.125% Notes [Member]
Dec. 31, 2012
Unsecured Debt [Member]
5.125% Notes [Member]
Dec. 31, 2013
Foreign Credit Facilities [Member]
Dec. 31, 2012
Foreign Credit Facilities [Member]
Dec. 31, 2013
Capital Lease Obligations [Member]
Dec. 31, 2012
Capital Lease Obligations [Member]
Jun. 30, 2013
Class C [Member]
Revolving Credit Facility [Member]
Mar. 20, 2013
Class C [Member]
Revolving Credit Facility [Member]
Dec. 31, 2013
Debt Repurchase [Member]
Unsecured Debt [Member]
7.875% Notes [Member]
Dec. 31, 2013
Debt Redemption [Member]
Unsecured Debt [Member]
7.875% Notes [Member]
Debt Instrument [Line Items]                                                                          
Line of credit facility, amount outstanding       $ 0 $ 0                                                 $ 53,800,000 $ 61,000,000            
Long-term debt             150,000,000 0 0 337,500,000     0 0 300,000,000 300,000,000   200,000,000 200,000,000   550,000,000 550,000,000       400,000,000 0 200,000,000 0                
Capital lease obligations                                                               5,300,000 5,600,000        
Long-term debt and capital lease obligations 1,559,100,000 1,454,100,000                                                                      
Amended revolving facility, maximum borrowing capacity       523,500,000                                                                  
Amended revolving facility, remaining borrowing capacity       501,600,000                                                                  
Amended revolving facility, standby letters of credit issued against the facility       21,900,000                                                                  
Increase in Amended Revolving Facility aggregate commitments       158,500,000                                                                  
Debt issuance costs 16,700,000 10,600,000 10,900,000 6,900,000 1,700,000 5,900,000                       5,000,000     0         6,600,000   3,100,000                  
Amended Revolving Facility, interest rate description Borrowings under the Amended Revolving Facility and Term Facility bear interest at rates based on adjusted LIBOR or an alternate base rate, plus an applicable margin. The applicable margin for LIBOR-based loans will be between 1.5% and 3.0%.                                                                        
Line of credit facility, reduction in borrowing capacity, termination of loan facility                                                                     72,800,000    
Write off of deferred debt issuance cost                                                                   500,000      
Debt instrument, face amount                       425,000,000         300,000,000     200,000,000     550,000,000   250.0                        
Debt instrument, interest rate, stated percentage                 9.25%       7.875% 7.875%         7.75%   6.625%     0.00%   6.25%   5.125%                  
Debt instrument, original discount amount                       5,500,000                                                  
9.25% Notes, percentage redeemed                   10.00% 10.00%                                                    
9.25% Notes, premium percentage applicable to voluntary redemption during the period                   103.00% 103.00%                                                    
Repayments of long-term debt 652,000,000 299,100,000 56,000,000           340,000,000 42,500,000 42,500,000                                                    
Debt instrument, early redemption premium                 18,900,000 1,300,000       3,300,000                                              
Debt refinancing and redemption costs 36,800,000 19,800,000 3,100,000           6,700,000 1,000,000 1,400,000                                                 1,200,000 900,000
Debt instrument, decrease, repayments                 42,500,000                                                        
Debt instrument, redemption amount                 190,000,000         127,400,000                                              
Debt instrument, tender premium                         5,200,000                                                
Debt instrument, tender offer, fees                           100,000                                              
Debt instrument, repurchased face amount                             172,600,000                   137,800,000                        
Foreign credit facilities, remaining borrowing capacity                                                           56,700,000              
Interest expense 115,900,000 101,600,000 83,900,000                                                                    
Interest costs, capitalized during period 6,600,000 8,200,000 8,300,000                                                                    
Long-term debt, weighted average interest rate 6.30% 7.90% 8.00%                                                         8.90%          
Interest payable, current 19,900,000 35,100,000                                                                      
Investment income 600,000 600,000 1,200,000                                                                    
9.25% Senior Secured Notes, Amount Paid for Redemption Premium During the Period                     $ 1,300,000