Stockholders' Equity (Details 2) (Restricted Stock, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock
Shares [Rollforward]
Nonvested at Beginning of Period	141,561	115,506	62,146
Granted	84,547	109,261	119,826
Vested	(85,681)	(72,194)	(59,936)
Forfeited	(25,041)	(11,012)	(6,530)
Nonvested at End of Period	115,386	141,561	115,506
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested at Beginning of Period	$ 12.52	$ 10.63	$ 13.60
Granted	$ 27.71	$ 13.76	$ 10.07
Vested	$ 14.59	$ 11.47	$ 12.47
Forfeited	$ 13.38	$ 11.84	$ 11.71
Nonvested at End of Period	$ 21.93	$ 12.52	$ 10.63