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Debt (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 18, 2013
Subsidiaries [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Base Rate [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Debt Instrument, Redemption, Period One [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Debt Instrument, Redemption, Period One [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Debt Instrument, Redemption, Period Two [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term B Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Jun. 30, 2014
2012 Credit Agreement [Member]
Term B Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
Senior Notes [Member]
Dec. 31, 2013
Senior Notes [Member]
Jun. 30, 2014
Convertible Notes payable [Member]
Dec. 31, 2013
Convertible Notes payable [Member]
Jun. 30, 2014
Capital Lease Obligations [Member]
Dec. 31, 2013
Capital Lease Obligations [Member]
Jun. 30, 2014
Capital Lease Obligations [Member]
Minimum [Member]
Jun. 30, 2014
Capital Lease Obligations [Member]
Maximum [Member]
Debt Instrument [Line Items]                                                    
Long-term Line of Credit         $ 51,000,000 $ 74,500,000         $ 499,900,000 $ 522,500,000       $ 720,800,000 $ 737,300,000                  
Senior Notes, Noncurrent                                     375,000,000 375,000,000            
Convertible notes payable                                         102,100,000 99,600,000        
Capital Lease Obligations And Other                                             27,200,000 27,600,000    
Total debt 1,776,000,000   1,836,500,000                                              
Less current portion (52,800,000)   (39,600,000)                                              
Long-term debt 1,723,200,000   1,796,900,000                                              
Principal borrowing capacity, maximum         350,000,000           550,000,000         870,000,000                    
Line of Credit Facility, Interest Rate at Period End             5.50% 3.40%             2.65%     3.50%                
Letters of Credit Outstanding, Amount                 17,500,000                                  
Line of Credit Facility, Remaining Borrowing Capacity           281,500,000                                        
Debt Instrument, Periodic Payment                   1,800,000     6,800,000 13,500,000                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid                     324,300,000         680,600,000                    
Proceeds from 2012 Credit Agreement 106,500,000 2,368,800,000     106,500,000                                          
Stated percentage (in hundredths)                                     6.875%   8.00%          
Outstanding Convertible Notes Percentage                                         83.00%          
Debt convertible ratio, period I                                         2,325.43          
Debt convertible ratio, period II                                         2,200          
Debt convertible ratio numerator                                         1,000          
Future Convertible Notes Percentage                                         17.00%          
Index rate or LIBOR plus (in hundredths)             2.00% 3.00%             2.25%     2.75%                
Line of credit facility, initiation date                                     Dec. 19, 2012              
Line of credit facility, expiration date                                     Dec. 15, 2020   Jul. 15, 2016          
Prepayment of line of credit 169,100,000 926,600,000     130,000,000           22,600,000         16,500,000                    
Prepayments of Debt                     9,100,000         12,800,000                    
Interest rate swap period 4 years                                                  
Domestic qualified cash, Maximum (in hundredths)                 100.00%                                  
Foreign qualified cash, maximum (in hundredths)                 60.00%                                  
Domestic and Foreign Qualified Cash, Maximum                 150,000,000                                  
Domestic Qualified Cash                 80,900,000                                  
Foreign qualified cash, Maximum                 24,400,000                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt       96,200,000                                            
Long-term debt, senior note                                         102,100,000          
Accreted discount                                         $ 6,200,000          
Remaining terms of leases                                                 8 years 10 years