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Stockholders' Equity Stockholders' Equity (Narrative) (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
May 22, 2013
May 31, 2012
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 23, 2012
May 22, 2012
Mar. 05, 2012
May 22, 2013
Employee Stock Option
Dec. 31, 2013
Employee Stock Option
Dec. 31, 2012
Employee Stock Option
Dec. 31, 2011
Employee Stock Option
Dec. 31, 2013
Employee Stock Option
Maximum
Dec. 31, 2013
Employee Stock Option
Minimum
Dec. 31, 2013
Employee Stock Purchase Plan
Sep. 30, 2013
Employee Stock Purchase Plan
Jun. 30, 2013
Employee Stock Purchase Plan
Mar. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Sep. 30, 2012
Employee Stock Purchase Plan
Jun. 30, 2012
Employee Stock Purchase Plan
Mar. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Sep. 30, 2011
Employee Stock Purchase Plan
Jun. 30, 2011
Employee Stock Purchase Plan
Mar. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2013
Restricted Stock
Maximum
Dec. 31, 2013
Restricted Stock
Minimum
Aug. 31, 2012
Performance Shares
Dec. 31, 2013
Performance Shares
Aug. 31, 2012
Performance Shares
Maximum
Aug. 31, 2012
Performance Shares
Minimum
Dec. 31, 2013
Former Executive Officer [Member]
Employee Stock Option
Mar. 05, 2012
Compensation And Corporate Governance Committee Chairman
May 23, 2012
Audit Committee Chairman
Mar. 05, 2012
Audit Committee Chairman
Mar. 05, 2012
Board of Directors Chairman
Mar. 05, 2012
Director
Dec. 31, 2013
Nineteen Ninety Six Plan [Member]
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                                  
Contractual term of all options granted                                 10 years 5 years                                                              
Number of shares authorized under stock based compensation plans                   5,000,000 2,850,000                                                                            
Shares expired             64,000 24,000 162,000                                                                               2,000
Stock options awarded (in shares) 562,500           563,000 96,283 210,549                                                                                
Award vesting period (in years)                         3 years                                               4 years 3 years                      
Value of stock options granted $ 2,300,000             $ 200,000 $ 500,000                                                                                
Intrinsic value of outstanding stock options     4,982,000       4,982,000                                                                                    
Intrinsic value of exercisable stock options     2,727,000       2,727,000                                                                                    
Total intrinsic value of options exercised             500,000 300,000 204,000                                                                                
Total fair value of stock options vested                           224,000 142,000 60,000                                                                  
Share based compensation expense                           797,000 218,000 237,000                             277,000 135,000 100,000 1,700,000 1,400,000 1,900,000                          
Allocated Share Based Compensation Expense Due to Higher Grant Price                           300,000                                                                      
Allocated Share Based Compensation Due to Accelerated Vesting                                                                   400,000                 300,000            
Unrecognized share based compensation cost                           1,600,000                                       2,800,000                              
Unrecognized share based compensation, expected term (in years)                           2 years 4 months 6 days                                       1 year 4 months 24 days                              
Director compensation, annual cash retainer                                                                                       15,000   17,500 115,000 40,000  
Director compensation, annual equity retainer                                                                                               75,000  
Vesting percentage per period                           33.333%                                             33.333% 25.00%                      
Purchase price percentage of grant date price per share (as a percent)                                                             85.00%                                    
Shares purchased through Employee Stock Purchase Plan (in shares)             76,272 100,620 86,287                                                                                
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share)             $ 11.89 $ 4.92 $ 4.15                                                                                
Number of required days over hurdle price out of measurement period             3 days                                                                                    
Measurment period for number of required days over hurdle price             30 days                                                                                    
Performance award purchase price option 1 (in dollars per share)             $ 0.50                                                                                    
Performance award purchase price option 2 (in dollars per share)             $ 9.00                                                               $ 9.07                    
Performance awards granted (in shares)                                                                             1,705,000                    
Fair value of performance award grant                                                                               1,500,000                  
Performance award hurdle price (in dollars per share)     $ 21.50       $ 21.50                                                               $ 21.50                    
Fair value assumption, share price (in dollars per share)                                                                             $ 7.76                    
Expected dividend yield                           0.60% 1.70% 0.00%                             0.60% 1.70% 0.00%           1.70%                    
Expected life (years)                           3 years 7 months 6 days 3 years 3 years     1 year 9 months 6 months 3 months 1 year 9 months 6 months 3 months 1 year 9 months 6 months 3 months                 3 years 4 months 13 days                    
Expected volatility                           33.63% 60.09% 60.09%                             41.00% 32.00% 29.00%           31.30%                    
Fair value assumption, expected volatility weighting percentage applicable to weekly stock price (percent)                                                                             5.00%                    
Fair value assumption, expected forfeiture rate (percent)                                                                                 5.00% 3.00%              
Directors fees approved under new Directors Compensation Policy, other committee members and chairs                       2,000                                                                          
Directors fees approved under new Directors Compensation Policy                       1,600                                                                          
Shares of common stock issued (in shares)                                                                                         17,928        
Directors compensation expense             800,000 800,000 557,000                                                                                
Dividends declared per share (in dollars per share)     $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.10 $ 0.10 $ 0.075                                                                                
Cash dividends declared on common stock             1,817,000 1,804,000 1,376,000                                                                                
Additional amount of common stock company was authorized to purchase   8,000,000                                                                                              
Payments for buy back of common stock             0 4,531,000 736,000                                                                                
Dividends on common stock             $ 1,817,000 $ 1,804,000 $ 1,376,000