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Stock-based Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 21, 2013
Apr. 29, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Nov. 30, 2000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock reserved for issuance           10,000,000 300,000
Stock incentive plan, additional shares authorized 900,000            
Compensation expense     $ 2,936,000 $ 2,160,000 $ 1,917,000    
Scenario, Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock incentive plan, additional shares authorized     680,000        
Increase to number of shares reserved for issuance as a percentage of outstanding shares     5.00%        
Restricted Stock Units (RSUs) [Member] | 2011 Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted           546,000  
Grant-date fair value of units granted           $ 2,500,000  
Compensation expense       400,000 $ 400,000    
Unrecognized compensation cost     $ 100,000        
Unrecognized compensation cost, recognition period     1 year        
Restricted Stock Units (RSUs) [Member] | 2013 Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted         342,000    
Grant-date fair value of units granted         $ 2,300,000    
Compensation expense     $ 500,000 800,000      
Unrecognized compensation cost     $ 100,000        
Unrecognized compensation cost, recognition period     1 year        
Restricted Stock Units (RSUs) [Member] | 2015 Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted     302,000        
Grant-date fair value of units granted     $ 5,300,000        
Compensation expense     1,100,000        
Unrecognized compensation cost     4,200,000        
Unrecognized compensation cost, realized over two years     700,000        
Unrecognized compensation cost, realized over four years     $ 3,500,000        
Restricted Stock Units (RSUs) [Member] | Vesting Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     2 years        
Restricted Stock Units (RSUs) [Member] | Vesting Tranche Three [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     5 years        
Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period     4 years        
Plan duration     10 years        
Intrinsic value of options exercised     $ 1,100,000 $ 1,300,000 12,800,000    
Dividend rate     0.00% 0.15%      
Options exercisable     164,167 118,161      
Options exercisable, average exercise price     $ 6.95 $ 4.75      
Shares available for future issuance     487,824        
Options granted in period     58,000        
Unrecognized compensation cost     $ 1,600,000        
Unrecognized compensation cost, recognition period     4 years        
Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock reserved for issuance             600,000
Stock incentive plan, additional shares authorized   600,000          
Shares available for future issuance     208,360        
Common stock purchase price, percentage of fair market value     85.00%        
Shares issued under ESPP     59,781 50,759      
Compensation expense     $ 324,250 $ 461,980 $ 409,079    
Employee Stock Purchase Plan [Member] | Scenario, Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock incentive plan, additional shares authorized     400,000        
Increase to number of shares reserved for issuance as a percentage of outstanding shares     1.00%