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Stockholders' Equity and Employee Stock Option Plans 1997 Stock Plan (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Apr. 01, 2013
Mar. 31, 2013
Dec. 31, 2012
Equity [Abstract]            
Common Stock, Capital Shares Reserved for Future Issuance 867,755     1,090,540 2,097,283  
Options and SARS, Outstanding, Number 285,536 410,484 259,679   550,540 393,931
Share-based Compensation Arrangement by Share-based Payment Award, Additional Shares Authorized in 2013 Amendment       540,000    
Number of Additional Shares Authorized   712,203        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 517,505 457,585 515,217   1,546,743 1,346,758
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years) 4 years          
1997 Stock Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Purchase price as a percent of fair market value 100.00%          
Purchase price as a percent of fair market value for owners of more than 10% of stock 110.00%          
1997 Stock Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award expiration term (in years) 5 years          
Award vesting period (in years) 4 years          
1997 Stock Plan [Member] | Stock Appreciation Rights (SARs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Purchase price as a percent of fair market value 100.00%          
Award expiration term (in years) 5 years          
Award vesting period (in years) 4 years          
1997 Stock Plan [Member] | Granted From May 6, 2003 To March 31, 2013 [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award expiration term (in years) 5 years          
1997 Stock Plan [Member] | Granted After March 31, 2013 [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award expiration term (in years) 10 years