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Stockholders' Equity Stockholders' Equity (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 01, 2016
$ / shares
Sep. 01, 2016
$ / shares
Aug. 09, 2016
shares
Jun. 01, 2016
$ / shares
May 17, 2016
USD ($)
Mar. 01, 2016
$ / shares
Sep. 28, 2015
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
$ / shares
shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
quarterly_dividend
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Common stock, shares authorized (in shares) | shares               80,000,000           80,000,000 80,000,000  
Common stock, par value (in dollars per share) | $ / shares               $ 0.01           $ 0.01 $ 0.01  
Common stock, shares issued (in shares) | shares               22,490,855           22,490,855 22,497,873  
Common stock, shares outstanding (in shares) | shares               22,490,855           22,490,855 22,497,873  
Treasury stock, shares (in shares) | shares               5,849,316           5,849,316 5,849,316  
Stock options awarded (in shares) | shares                           236,000 653,000 804,000
Grants, weighted average exercise price | $ / shares                           $ 20.06 $ 22.66 $ 20.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | shares                 146,100         187,000 229,000 121,000
Shares purchased through Employee Stock Purchase Plan (in shares) | shares                           44,774 44,074 55,877
Weighted average purchase price of ESPP shares purchased during the period (in dollars per share) | $ / shares                           $ 19.48 $ 17.17 $ 15.50
Share-Based Compensation Arrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By EBITDA                     25.00%          
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance                     75.00%          
Dividends declared per share (in dollars per share) | $ / shares               $ 0.05 $ 0.05 $ 0.025 $ 0.025     $ 0.15 $ 0.10 $ 0.10
Dividends declared, common stock, amount                           $ 2,500,000 $ 1,800,000  
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 50.00 $ 0.05   $ 0.025   $ 0.025               $ 0.05 $ 0.025  
Number Of Quarterly Dividends Paid | quarterly_dividend                             4  
Common Stock, Quarterly Dividends, Per Share, Cash Paid | $ / shares                             $ 0.025  
Number Of Quarterly Dividends Declared | quarterly_dividend                             2  
Common Stock, Quarterly Dividends, Per Share, Declared | $ / shares                             $ 0.025  
Employee Stock Option                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Contractual term of all options granted                           7 years    
Stock options awarded (in shares) | shares                       235,500     628,000 803,700
Grants, weighted average exercise price | $ / shares                       $ 20.06        
Incremental award vesting percentage                     20.00%          
Award vesting period (in years)                     5 years          
Stock option, contracted term                       10 years        
Value of stock options granted                       $ 1,300,000     $ 3,700,000 $ 4,100,000
Intrinsic value of outstanding stock options               $ 15,607,000           $ 15,607,000    
Intrinsic value of exercisable stock options               11,537,000           11,537,000    
Total intrinsic value of options exercised                           1,200,000 1,100,000 953,000
Total fair value of stock options vested                           2,786,000 1,808,000 752,000
Share based compensation expense                           1,721,000 2,431,000 1,594,000
Decrease in Share-based Compensation Expense, Cancellation Of Options                           200,000    
Decrease In Allocated Share-Based Compensation Expense, Full Vesting Of Grant                           300,000    
Unrecognized share based compensation cost               1,500,000           $ 1,500,000    
Unrecognized share based compensation, expected term (in years)                           2 years    
Employee Stock Option | Maximum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Contractual term of all options granted                           10 years    
Employee Stock Option | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Contractual term of all options granted                           5 years    
Employee Stock Purchase Plan                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share based compensation expense                           $ 234,000 197,000 260,000
Purchase price percentage of grant date price per share (as a percent)                           85.00%    
Restricted Stock                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share based compensation expense                           $ 700,000 1,500,000 1,800,000
Unrecognized share based compensation cost               $ 1,100,000           $ 1,100,000    
Unrecognized share based compensation, expected term (in years)                           1 year 4 months 24 days    
Restricted Stock | Maximum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Award vesting period (in years)                       3 years   4 years    
Vesting percentage per period                           33.33%    
Restricted Stock | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Award vesting period (in years)                           3 years    
Vesting percentage per period                           25.00%    
Restricted Stock Units (RSUs)                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares                           91,000    
Awards granted | shares                       16,900   17,960    
Awards granted, aggregate grant date market value                       $ 300,000        
Performance Shares                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Awards granted | shares                 14,200   73,700          
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value                     $ 1,600,000          
Executive Officer [Member] | Restricted Stock                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares                           50,000    
Officers And Key Employees [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Directors compensation expense                           $ 221,000    
Board of Directors                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares of common stock issued (in shares) | shares     1,061       25,000                  
Directors compensation expense                           $ 400,000 $ 700,000 $ 800,000
Audit Committee Chairman                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Director compensation, annual cash retainer         $ 10,000                      
Director Compensation, Quarterly Installment Of Annual Cash Retainer         2,500                      
Director                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Director compensation, annual cash retainer         75,000                      
Director Compensation, Quarterly Installment Of Annual Cash Retainer         18,750                      
Corporate Governance Committee Chairman [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Director compensation, annual cash retainer         5,000                      
Director Compensation, Quarterly Installment Of Annual Cash Retainer         1,250                      
New Director [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Director compensation, annual cash retainer         $ 25,000                      
Share-based Compensation Award, Tranche One [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Incremental award vesting percentage                         50.00%      
Share-based Compensation Award, Tranche Two [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Incremental award vesting percentage                         25.00%