Share-Based Compensation - Summary of Stock Option Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Shares
Outstanding, beginning of period (in shares)	1,115,513
Granted (in shares)	47,500
Exercised (in shares)	(180,935)
Forfeited or Expired (in shares)	(50,025)
Outstanding, end of period (in shares)	932,053
Exercisable, end of period (in shares)	388,743
Weighted Average Exercise Price
Outstanding, beginning of period (weighted average exercise price)	$ 10.15
Granted (weighted average exercise price)	$ 17.70
Exercised (weighted average exercise price)	$ 8.11
Forfeited or Expired (weighted average exercise price)	$ 11.82
Outstanding, end of period (weighted average exercise price)	$ 10.84
Exercisable, end of period (weighted average exercise price)	$ 8.62