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Stock-Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
hours
Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Aug. 31, 2011
Employee Stock Purchase Plan [Member]
Aug. 31, 2010
Employee Stock Purchase Plan [Member]
Dec. 31, 2009
Employee Stock Purchase Plan [Member]
Aug. 31, 2009
Employee Stock Purchase Plan [Member]
Dec. 31, 2011
Performance Stock Plan [Member]
days
Dec. 31, 2010
Performance Stock Plan [Member]
Dec. 31, 2009
Performance Stock Plan [Member]
Dec. 31, 2008
Performance Stock Plan [Member]
Jul. 31, 2009
Performance Stock Plan [Member]
Powell Brown [Member]
Dec. 31, 2011
Incentive Stock Option Plan [Member]
Dec. 31, 2010
Incentive Stock Option Plan [Member]
Dec. 31, 2009
Incentive Stock Option Plan [Member]
Dec. 31, 2011
Incentive Stock Option Plan [Member]
Minimum [Member]
Dec. 31, 2011
Incentive Stock Option Plan [Member]
Maximum [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
years
Dec. 31, 2010
Stock Incentive Plan [Member]
Apr. 28, 2010
Stock Incentive Plan [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
Decus [Member]
Dec. 31, 2010
Stock Incentive Plan [Member]
Decus [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
Minimum [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                
Shares available for issuance under the PSP                                       6,046,768        
Maximum number of shares available to be granted under PSP               14,400,000   187,040                            
Shares available for issuance or authorized shares   12,000,000                     4,800,000                      
Grant of shares made under the SIP               7,113,819                     187,040          
Grants made to Decus employees under the SIP sub-plan                                   2,375,892     24,670 5,205    
Shares awarded               37,408                                
Shares available for future grants or for future subscriptions   2,297,258                               4,808,124            
Shares reserved for grants with PSP-type vesting conditions                                   2,261,307            
Incremental increases in the 20-trading-day average stock price               20.00%                                
Number of years of continuous employment               15       20                        
Attainment age               64                                
Initial stock prices, minimum               $ 1.90                                
Initial stock prices, maximum               $ 30.55                                
Shares not meeting first condition for vesting               1,586,543                                
Shares met the first condition for vesting and awarded               3,345,269 3,391,519 4,423,436 4,629,221             37,408 38,449          
Shares distributed to the participants               2,182,007                                
Weighted average grant-date fair value of PSP grants               $ 0.00 $ 9.67 $ 11.80               $ 23.94 $ 12.62          
Total fair market value of PSP grants               $ 2,384,000 $ 31,965,000 $ 1,412,000                            
Maximum percentage of allotment through payroll deductions   10.00%                                            
Allotted value, maximum, to purchase Company stock   25,000                                            
Subscription Period, beginning   August 1                                            
Subscription Period, ending     July 31                                          
Stock price, percentage   85.00%                                            
Quoted market price of Company's stock   15.00%                                            
Value of a one-year stock option, percentage   85.00%                                            
Fair value of an ESPP share option       $ 4.27 $ 4.01   $ 5.78                                  
Number of hours worked per week by employees   20                                            
Grants currently outstanding percentage               20.00%                                
Issued shares of common stock       488,052 500,334   579,104                                  
Aggregate purchase price of issued common stock   8,048,000 8,326,000.00     9,358,000.00                                    
Aggregate purchase price per share of issued common stock   $ 16.49 $ 16.64     $ 16.16                                    
Shares of common stock subscribed   230,481 206,201     250,414                                    
Proceeds by participants   3,810,000 3,400,000     3,826,000                                    
ISOP expiry date                         December 31, 2008                      
Pre-tax income annual percentage                         15.00%                      
Vesting period, minimum (in years)                         one                      
Vesting period, maximum (in years)                         10                      
Accelerated vesting period (in years)                               three six           six ten
Options expire period (in years)                         10                      
Expected term of the options granted (in years)                                   5            
Total intrinsic value of options exercised                         333,000 2,344,000 948,000                  
Unrecognized compensation expense $ 65,000,000                                              
Unrecognized compensation expense, weighted-average period (in years) 9.2