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Stock-Based Compensation (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Number of Stock Options:    
Outstanding, beginning of period (in shares) 378,852  
Granted (in shares) 50,000  
Exercised (in shares) (3,500)  
Canceled/Forfeited (in shares) (1,333)  
Outstanding, end of period (in shares) 424,019 378,852
Exercisable (in shares) 341,185  
Weighted Average Exercise Price:    
Outstanding, weighted average exercise price, beginning of period (in USD per share) $ 15.61  
Granted, weighted average exercise price (in USD per share) $ 30.41  
Exercised, weighted average exercise price (in USD per share) $ 17.13  
Canceled/Forfeited, weighted average exercise price (in USD per share) $ 17.99  
Outstanding, weighted average exercise price, end of period (in USD per share) $ 17.33 $ 15.61
Exercisable, weighted average exercise price (in USD per share) $ 15.34  
Options, Weighted Average Remaining Contractual Term:    
Outstanding, weighted average remaining contractual life 5 years 3 months 19 days 5 years 2 months 23 days
Exercisable, weighted average remaining contractual life 4 years 4 months 1 day  
Options, Intrinsic Value:    
Outstanding, aggregate intrinsic value $ 6,669 $ 4,533
Exercised, Aggregate Intrinsic Value 48  
Canceled/Forfeited Aggregate Intrinsic Value 16  
Exercisable, aggregate intrinsic value $ 6,045