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Share-Based Payments - Option Rollforward (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning (in shares) 1,137,283  
Granted (in shares) 127,500  
Expired and canceled (in shares) (4,323)  
Forfeited prior to vesting (in shares) (26,536)  
Exercise of stock options (in shares) (122,650)  
Outstanding, ending (in shares) 1,111,274 1,137,283
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Weighted average exercise price, outstanding, beginning (in dollars per share) $ 4.63  
Weighted average exercise price, granted (in dollars per share) $ 8.52  
Weighted average exercise price, expired and canceled (in dollars per share) $ 4.03  
Weighted average exercise price, forfeited prior to vesting (in dollars per share) $ 4.73  
Weighted average exercise price, exercised (in dollars per share) $ 3.99  
Weighted average exercise price, outstanding, ending (in dollars per share) $ 5.15 $ 4.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]    
Vested (in shares) 850,159  
Vested, weighted average exercise price (in dollars per share) $ 4.76  
Vested, weighted average remaining contractual term (in years) 3 years 7 months 13 days  
Vested, aggregate intrinsic value (in dollars) $ 3,395,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, weighted average remaining contractual term (in years) 4 years 10 months 10 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 4,016,000  
Weighted average grant date fair value, granted (in dollars per share) $ 4.38 $ 2.16
Intrinsic value of options exercised $ 448,000 $ 152,000