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Capital Stock (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Dec. 31, 2008
Feb. 28, 2010
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2010
Stock Options [Member]
Dec. 31, 2009
Stock Options [Member]
Dec. 31, 2009
VIP Plan RSU [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2009
Restricted Stock [Member]
Dec. 31, 2011
Pension Costs [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Dec. 31, 2008
Common Stock [Member]
Dec. 31, 2011
Performance Shares [Member]
VestingRange
Dec. 31, 2010
Performance Shares [Member]
Jul. 31, 2011
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2010
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2009
Restricted Stock Units (RSUs) [Member]
Capital Stock (Textual) [Abstract]                                                  
Exercise of stock options, Shares   363,000 380,000 180,000                         600,000 200,000              
Repurchase of common stock, shares   5,200,000                             3,900,000 1,200,000              
Common stock repurchase, amount authorized                                     $ 200,000,000            
Common stock repurchase, total remaining amount authorized                                 37,700,000                
Vesting period of performance shares   Equally over 3 years                                   3          
Expiry date of options outstanding as of December 31, 2011                             2021-03-14 2012-03-11                  
Options Granted   96,000 733,000 1,518,000             29,663 27,028 47,570             73,349 87,054   358,180 263,620 568,342
Fair value of granted stock                                       3,700,000 3,500,000   12,500,000 6,400,000 8,200,000
Vested restricted stock   1,071,000 1,084,000 974,000                                     214,863 227,165 102,300
Market value of vested restricted stock                                           700,000 4,900,000 4,900,000 2,500,000
Restricted Stock or Unit Expense                                             12,500,000 4,800,000 4,000,000
Common stock, shares reserved for issuance upon exercise of options or equity awards granted or to be granted             4,895,787 5,537,381 6,092,007                                
Vesting period of restricted stock units, minimum                                             2    
Vesting period of restricted stock units, maximum                                             3    
Vesting range of performance shares, minimum                                       0          
Vesting range of performance shares, maximum                                       3          
Stock granted under VIP Plan                   187,400                              
General and administrative   223,616,000 193,743,000 198,836,000                   15,700,000                      
Repurchase of common stock, amount   122,195,000 40,111,000                           162,300,000                
Capital Stock (Additional Textual) [Abstract]                                                  
Preferred stock, share authorized   25,000,000 25,000,000                                            
Preferred stock, par value   $ 1 $ 1                                            
Common stock, share authorized   725,000,000 725,000,000                                            
Common stock, par value   $ 0.001 $ 0.001                                            
Common stock, share issued   74,391,691 73,749,793                                            
Common stock, share outstanding   68,732,341 72,012,843                                            
Preferred Stock, share issued                                                    
Minimum percentage of shares acquired in exercisable rights     20.00%                                            
Minimum percentage of common stock acquired by stockholders for higher threshold     15.00%                                            
Term of options under Plans   10 years                                              
Vesting period of performance shares   Equally over 3 years                                   3          
Weighted average grant date fair value for options forfeited   1,200,000 1,700,000                                            
Unrecognized compensation cost related to non-vested stock options granted under the Plans   2,000,000                                              
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2012   1,500,000                                              
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2013   500,000                                              
Recognition of compensation related to non-vested stock options granted under the Plans   5,300,000 8,100,000 9,800,000                                          
Intrinsic value of options exercised   3,800,000 6,800,000 2,000,000                                          
Intrinsic value of outstanding in-the-money stock options   20,900,000 41,600,000                                            
Intrinsic value of exercisable stock options   12,600,000 14,300,000                                            
Weighted-average remaining life of options vested and expected to vest   5.4 6.2                                            
Weighted-average grant-date fair value of options granted   $ 11.27 $ 8.16 $ 3.74                                          
Expected volatility used in computing fair value of options granted   53.60% 52.70% 45.00%                                          
Expected life used in computing fair value of options granted, years   4                                              
Dividend yield used in computing fair value of options granted   3.80% 3.30% 2.30%                                          
Risk-free interest rate used in computing fair value of options granted   2.10% 2.60% 2.00%                                          
Estimated forfeiture rate used in computing fair value of options granted   11.20% 9.80% 9.00%                                          
Period of Historical data used to calculate expected volatility in years   5 years                                              
Value of each restricted stock unit and performance share unit in shares   1                                              
Decrease in value of accrued liabilities           4,000,000                                      
Other long-term liabilities   199,836,000 194,640,000     2,000,000                                      
Decrease in value of additional paid in capital           6,000,000                                      
Stock granted under VIP Plan   131,682 148,518 18,318 42,099                                        
Cash paid to grantees       1,900,000 500,000                                        
Fair value of restricted stock awards   1,000,000                                              
Compensation expense related to Mr. Moller's grants   4,700,000                                              
One time increase in pension plan benefits $ 11,000,000