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Stockholders' Equity (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Oct. 31, 2012
Oct. 31, 2010
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Employee Stock [Member]
HourPerWeek
Dec. 31, 2012
Stock Option [Member]
Dec. 31, 2011
Stock Option [Member]
Dec. 31, 2010
Stock Option [Member]
Dec. 31, 2012
Equity Plan [Member]
Installment
Dec. 31, 2012
2006 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
1996 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
2006 Director Plan [Member]
Equity Plan [Member]
Dec. 31, 2011
2006 Director Plan [Member]
Equity Plan [Member]
Dec. 31, 2010
2006 Director Plan [Member]
Equity Plan [Member]
Dec. 31, 2009
2006 Director Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
1996 Director [Member]
Equity Plan [Member]
Dec. 31, 2012
Maximum [Member]
2006 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
Maximum [Member]
1996 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
Minimum [Member]
2006 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
Minimum [Member]
1996 Equity Plan [Member]
Equity Plan [Member]
Dec. 31, 2012
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]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
Equity Plan [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
Equity Plan [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2010
Stock Options [Member]
Stockholders' Equity (Textual) [Abstract]                                                                    
Future awards granted or issued under plans                   400,000         2,500,000 0 0       0                          
Shares authorized                   1,500,000         4,350,000 13,500,000 450,000                                  
Shares returned                               2,500,000 80,000                                  
Options vested period                                           4 years 4 years 2 years 2 years         4 years 3 years 24 months 36 months 48 months
Option expiration period                             10 years 10 years                                    
Voting rights to holders                               10.00%                                    
Exercise price rate of fair value                   85.00%           110.00%                                    
Option Outstanding and vested     1,936,000       1,936,000 2,130,000               100,000 300,000       100,000                          
Option to repurchase shares of common stock             422,000       370,000                                              
Repurchase of common stock by non- employee                                   6,000 12,000 12,500                            
Number of installments upon option vest                           4                                        
Intrinsic value of options exercised                     $ 3,500,000 $ 4,100,000 $ 11,600,000                                          
Number of share receive on lapse and vesting condition met                                                   1                
Weighted average grant date fair value for RSUs granted             $ 33.88                                     $ 33.88 $ 33.15 $ 29.77            
Value of RSUs vested and converted to common stock                                                   1,600,000 400,000 0            
RSU's issued     301,000       301,000 267,000                                     71,000 63,000 95,496          
Payment for Common stock under the stock repurchase program                   12,500,000                                                
Performance of RSU's Vesting                                                     100% or 40% on April 1, 2014 100% or 40% on April 1, 2013 100% or 40% on April 1, 2012          
Performance of Outstanding RSU's                                                         40.00%          
Compensation expense Estimate vesting                   10.00%                                                
Purchase periods under the stock purchase plan                   6 months                                                
Hours of work per week                   20                                                
Compensation expense Estimate vesting                                                   0.00% 0.00% 100.00% 100.00%          
Modified Estimate vesting of RSU's                                                       0.00% 40.00%          
Holding period of stocks under stock purchase plan                   1 year                                                
Stockholders' Equity (Additional Textual) [Abstract]                                                                    
Preferred stock, shares authorized     500,000       500,000 500,000                                                    
Preferred stock, par value     $ 0.01       $ 0.01 $ 0.01                                                    
Authorized to Purchase of common stock under the stock repurchase program             310,000,000                                                      
Additional Purchase of Common Stock 50,000,000 60,000,000                                                                
Cumulative repurchase of common stock     9,200,000       9,200,000                                                      
Aggregate cost of repurchase of common stock     210,843,000       210,843,000 181,000,000                                                    
Annual dividend declared and paid per share     $ 0.56       $ 0.56                                                      
Dividend declared and paid per share     $ 0.14 $ 0.14 $ 0.14 $ 0.14                                                        
Aggregate dividend declared for the year             12,600,000                                                      
Payment of special cash dividend                 $ 68,400,000                                                  
Payment of special cash dividend, per share                 $ 3.00