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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Y
Jul. 02, 2011
Jun. 30, 2012
Y
Rate
Jul. 02, 2011
Y
Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation, number of shares authorized 10,000,000   10,000,000  
Compensation expense, all share-based payment plans $ 294 $ 367 $ 925 $ 704
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Volatility rate     11.70% 11.90%
Risk free interest rate     1.60% 2.90%
Expected dividend yield     1.50% 1.50%
Expected life of awards (years)     9.1 8.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding, beginning balance     1,110,785  
Granted     0  
Exercised     (117,260)  
Forfeited     0  
Outstanding, ending balance 993,525   993,525  
Exercisable 822,525   822,525  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Outstanding, weighted average exercise price, beginning balance     $ 10.62  
Granted, weighted average exercise price $ 0.00   $ 0.00  
Exercised, weighted average exercise price $ 8.05   $ 8.05  
Forfeited, weighted average exercise price $ 0.00   $ 0.00  
Outstanding, weighted average exercise price, ending balance $ 10.93   $ 10.93  
Exercisable, weighted average exercise price $ 9.81   $ 9.81  
Outstanding, weighted average remaining contractual life (years) 4.1   4.1  
Exercisable, weighted average remaining contractual life (years)     3.0  
Outstanding, unrecognized compensation cost 10,855   10,855  
Outstanding, aggregate intrinsic value 8,717   8,717  
Exercisable, aggregate intrinsic value 8,138   8,138  
Employee stock purchase plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock purchase plan, service period     1 year  
Employee stock purchase plan, percentage of market price, Purchase Date     85.00%  
Employee stock purchase, discount from market price, purchase date     15.00%  
Compensation cost     210 200
Stock options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost     80 190
Stock options, awarded, outstanding 615,501   615,501  
Stock options awarded, vesting period (years)     10  
Stock-Settled Stock Appreciation Rights (SARs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost     156 98
Stock appreciation rights, awarded     105,000  
Stock appreciation rights, vesting period     5  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, beginning balance     210,188  
Granted     105,000  
Forfeited     0  
Vested     (57,371)  
Unvested, ending balance 257,817   257,817  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, beginning balance     $ 3.47  
Granted, weighted average award date value     $ 2.70  
Forfeited, weighted average award date value $ 0   $ 0  
Vested, weighted average award date value     $ 3.43  
Unvested, weighted average award date value, ending balance $ 3.17   $ 3.17  
Weighted average remaining contractual life (years)     3.6  
Unrecognized compensation cost 699   699  
Aggregate intrinsic value 5,079   5,079  
Employee SSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, ending balance 218,400   218,400  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, ending balance $ 3.31   $ 3.31  
Weighted average remaining contractual life (years)     3.6  
Unrecognized compensation cost 609   609  
Aggregate intrinsic value 4,302   4,302  
Nonemployee director SSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, ending balance 39,417   39,417  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, ending balance $ 2.34   $ 2.34  
Weighted average remaining contractual life (years)     3.9  
Unrecognized compensation cost 90   90  
Aggregate intrinsic value 777   777  
Restricted stock units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost     479 216
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Unvested, beginning balance     113,908  
Granted     23,058  
Forfeited     0  
Vested     (58,313)  
Unvested, ending balance 78,653   78,653  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Unvested, weighted average award date value, beginning balance     $ 15.15  
Granted, weighted average award date value     $ 19.41  
Forfeited, weighted average award date value $ 0   $ 0  
Vested, weighted average award date value     $ 14.52  
Unvested, weighted average award date value, ending balance $ 16.87   $ 16.87  
Weighted average remaining contractual life (years)     2.4  
Unrecognized compensation cost 792   792  
Aggregate intrinsic value $ 1,549   $ 1,549