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Indebtedness (Narrative) (Details)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 2 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
Interest Accrual, Option Two
Dec. 31, 2013
Interest Accrual, Option Three
Dec. 31, 2013
Conversion Event, One
Dec. 31, 2013
Conversion Event, Two
Dec. 31, 2013
Minimum
Interest Accrual, Option One
Dec. 31, 2013
Maximum
Interest Accrual, Option One
Dec. 31, 2013
Revolving Credit Facility
USD ($)
Dec. 31, 2013
Senior Unsecured Term Loan Due May 2, 2016, 4.5%
USD ($)
Dec. 31, 2013
Senior Unsecured Term Loan Due May 2, 2016, 4.5%
EUR (€)
Dec. 31, 2012
Senior Unsecured Term Loan Due May 2, 2016, 4.5%
USD ($)
Dec. 31, 2013
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036
USD ($)
Dec. 31, 2012
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036
USD ($)
Dec. 31, 2013
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036
Maximum
Dec. 31, 2011
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033
USD ($)
Dec. 31, 2013
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033
Dec. 31, 2012
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033
Dec. 31, 2013
5 7/8% Senior Notes due 2021
USD ($)
Dec. 31, 2012
5 7/8% Senior Notes due 2021
USD ($)
Dec. 31, 2013
5 7/8% Senior Notes due 2021
Interest Accrual, Option Two
Dec. 31, 2013
Term Loan Facility
USD ($)
Dec. 31, 2013
Term Loan Facility
Future Periodic Payment
USD ($)
Dec. 31, 2013
Variable Basis, Additional Margin
Minimum
Interest Accrual, Option Three
Dec. 31, 2013
Variable Basis, Additional Margin
Maximum
Interest Accrual, Option Three
Dec. 31, 2013
GSI Holdings Corp.
5 7/8% Senior Notes due 2021
USD ($)
Feb. 28, 2014
Subsequent Event
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036
USD ($)
Debt Interest Rate                     4.50% 4.50% 4.50% 1.25% 1.25%     1.75% 1.75% 5.875% 5.875%              
Effective interest rate 6.10% 6.10% 6.10%                                                  
Debt Instrument Discount Amortization Period December 2013                                                      
Cash Payments for Interest $ 66,400,000 $ 70,000,000 $ 47,100,000                                                  
Debt maturity date                           Dec. 15, 2036                            
Convertible senior subordinated notes conversion price                           $ 40.44                            
Debt Instrument, Unamortized Discount                           0 9,200,000                          
Convertible senior subordinated notes, conversion rate                           24.7268   31.9183                        
Convertible senior subordinated notes principal amount per note                           1,000                            
Fundamental change, percentage of common stock 50.00%                                                      
Fundamental change, percentage of stock received 90.00%                                                      
Percent of closing sales price to conversion price           120.00%                                            
Trading Price per Note as a Percentage of Closing Price of Common Stoc           98.00%                                            
Lower limit for conversion rate adjustment, price per share                           $ 31.33                            
Upper limit for conversion rate adjustment, price per share                           $ 180.00                            
Additional make whole shares at lower limit                           7.3658                            
Additional make whole shares at upper limit                           0                            
Trading period of qualifying event           20 days 5 days                                          
Trading period in which qualifying event must occur           30 days                                            
Window for conversion             5 days                                          
Convertible notes converted                           100,000     161,000,000                     49,600,000
Stock Issued During Period, Shares, Conversion of Convertible Securities                           286     3,926,574                     377,957
Excess conversion value of the notes                           100,000     195,900,000                     21,900,000
Senior Notes                     275,000,000 200,000,000.0 264,200,000             300,000,000 300,000,000           300,000,000  
Maximum borrowing capacity                   600,000,000                         360,000,000.0          
Debt Instrument, Periodic Payment                                             5,000,000 10,000,000        
Debt Instrument, Basis Spread on Variable Rate       0.50% 1.00%     1.00% 2.00%                         0.50%     0.00% 0.50%    
Line of Credit Facility, Remaining Borrowing Capacity 600,000,000 515,000,000                                                    
Credit Facility 360,000,000 465,000,000                                                    
Outstanding letters of credit $ 16,700,000 $ 15,800,000