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Equity Incentive Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
person
Jan. 01, 2012
Jan. 02, 2011
Feb. 04, 2013
Feb. 16, 2011
Aug. 12, 2010
Dec. 31, 2012
Maximum
Feb. 16, 2011
Share based compensation awards other than option [Member]
Dec. 31, 2012
Restricted Stock [Member]
Jan. 01, 2012
Restricted Stock [Member]
Jul. 20, 2012
Restricted Stock [Member]
performance_metrics
Dec. 31, 2012
Restricted Stock [Member]
Minimum
Dec. 31, 2012
Restricted Stock [Member]
Maximum
Jul. 20, 2012
Restricted Stock [Member]
Maximum
Dec. 31, 2012
Employee Stock Purchase Plan [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Performance Based Share [Member]
Dec. 31, 2012
Stock Incentive Plan [Member]
Dec. 31, 2012
Stock Compensation Plan [Member]
Dec. 31, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options $ 0.6 $ 0.5 $ 3.9                                  
Common Stock Subject to Awards under Plan One         2,000,000 2,000,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.81 $ 9.75 $ 6.73                                  
Share based compensation arrangement by share based payment award number of shares authorized previously       4,400,000   2,400,000                            
Equity Incentive Plans (Additional Textual) [Abstract]                                        
Common stock available for the issuance of awards                 656,804                 1,946,417    
Retirement of common stock, shares 57,457                                      
Unrecognized compensation costs related to non vested stock option awards                 8.3             2.7     0.3  
Expected weighted average period to recognize expense                   2 years 2 months 19 days           2 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,087,385 1,083,000 4,400,000   2,166,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             10 years   3 years     3 years 4 years              
Number of RTS Employees with Unvested Stock Options and Restricted Stocks 19                                      
Stock Option Vest Immediately for the Chief Executive Officer   100.00%                                    
Share Based Compensation Arrangement by Share Based Payment Award Non Vested Stock Options Outstanding Number 476,000 605,000                                   24,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 584,000 442,000                                   8,375
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value                 $ 5.8 $ 9.3                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 315,000               315,000               205,000      
Schedule of Share-based compensation, Options, Share Conversion Ratio 1.156                                      
Number of Employees in Stock-based Compensation Plan 313                                      
Incremental Shares Granted due to Anti-dilution Provision 167,000                                      
Number of annual performance metrics                     2                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Weighted Towards Earnings Per Share Performance                           75.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Weighted Towards Capital Performance Targets                           25.00%            
Discount on purchase of Common Stock for employee from the current market price                             5.00%          
Stock Issued During Period, Shares, Employee Stock Purchase Plans                             22,760          
Maximum Shares Authorized Under ESPP for Sale Offer to Eligible Employees                             500,000