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Stockholders' Equity (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 05, 2012
Director Compensation Policy [Member]
Mar. 31, 2014
ESPP
Mar. 31, 2013
ESPP
Mar. 31, 2014
Restricted Stock
Mar. 31, 2013
Restricted Stock
Mar. 31, 2014
Restricted Stock
Maximum [Member]
Mar. 31, 2014
Restricted Stock
Minimum [Member]
Mar. 03, 2014
Stock Options
executive
Feb. 25, 2014
Stock Options
Mar. 31, 2014
Stock Options
Mar. 31, 2013
Stock Options
Mar. 31, 2014
Stock Options
Maximum [Member]
Mar. 31, 2014
Stock Options
Minimum [Member]
Mar. 31, 2014
Performance Shares
Mar. 03, 2014
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share based compensation awards, options outstanding at period end (in Shares)                       1,414,421          
Share based compensation awards, options outstanding and unvested at period end (in Shares)                       1,243,521          
Shares purchased through Employee Stock Purchase Plan (in Shares)       18,471                          
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share)       $ 15.50                          
Share-based compensation expense       $ 116,000 $ 99,000 $ 349,000 $ 313,000         $ 265,000 $ 47,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           4 years   4 years 3 years     3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       5 years          
Stock Granted, Value, Share-based Compensation, Net of Forfeitures                       3,900,000          
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures           4,100,000                      
Share based compensation awards, vesting percentage per period (in Percent)           25.00%               25.00% 33.33%    
Unrecognized share based compensation           6,000,000                      
Unrecognized share based compensation, expected term (in Duration) 2 years 9 months 18 days                                
Performance award hurdle price (in Dollars per share)                               $ 21.50  
Number of days market price must exceed limit to vest                               3 days  
Term when market price must exceed limit to vest                               30 days  
Payment for Non-cash Exercise of Share-based Awards, Base Rate Per Share                               $ 19.00  
Payments for Non-cash Exercise of Share-based Awards                               16,100,000  
Performance award purchase price option 1 (in Dollars per share)                               $ 0.50  
Performance award purchase price option 2 (in Dollars per share)                               $ 9  
Directors fees approved under new Directors Compensation Policy, audit committee chair     17,500                            
Directors fees approved under new Directors Compensation Policy, compensation and corporate governance chair     15,000                            
Directors fees approved under new Directors Compensation Policy, lead director     115,000                            
Directors fees approved under new Directors Compensation Policy, each independent director     40,000                            
Directors fees approved under new Directors Compensation Policy, each independent director per regular or scheduled meeting     75,000                            
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                            
Stock issued to directors           200,000                      
Directors compensation expense 175,000 133,000                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   300,000 457,700            
Number of Executives                   3              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value                   $ 20.49 $ 20.26            
Common Stock, Dividends, Per Share, Declared $ 0.025 $ 0.025                             $ 0.025
Dividends, Common Stock, Cash                                 $ 500,000