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Stock-Based Compensation (Details 1) (Stock Appreciation Rights (Sars) [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Stock Appreciation Rights (Sars) [Member]
  
Balance, beginning (in shares) 351,881
Granted, (in shares) 85,943
Exercised, (in shares) (3,192)
Balance, ending (in shares) 434,632
Exercisable, (in shares) 257,504
Outstanding, weighted average exercise price (in dollars per share) $ 27.52
Granted, weighted average exercise price (in dollars per share) $ 42.14
Exercised, weighted average exercise price (in dollars per share) $ 29.66
Outstanding, weighted average exercise price (in dollars per share) $ 30.4
Exercisable, weighted average exercise price (in dollars per share) $ 25.78
Outstanding, average remaining contractual term years, beginning 7 years 4 months 2 days
Outstanding, average remaining contractual term years, ending 7 years 7 months 6 days
Exercisable, average remaining contractual term years 6 years 5 months 16 days
Outstanding, aggregate intrinsic value $ 4,988
Outstanding, aggregate intrinsic value 5,061
Exercisable, aggregate intrinsic value $ 4,187