Stock Compensation Plans (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Options outstanding, January 1, 2015	173,720
Options Outstanding, Forfeited or cancelled	4,750
Options Outstanding, Exercised	48,500
Options Outstanding, Granted	6,250
Options outstanding, March 31, 2015	126,720
Options Outstanding, Vested or expected to vest at March 31, 2015	126,720
Options Outstanding, Exercisable at March 31, 2015	112,070
Weighted Average Exercise Price, Outstanding, January 1, 2015	$ 20.8
Weighted Average Exercise Price, Forfeited or cancelled	$ 25.32
Weighted Average Exercise Price, Exercised	$ 21.82
Weighted Average Exercise Price, Granted	$ 32.94
Weighted Average Exercise Price, Outstanding, March 31, 2015	$ 20.84
Weighted Average Exercise Price, Vested or expected to vest at March 31, 2015	$ 20.84
Weighted Average Exercise Price, Exercisable at March 31, 2015	$ 19.7
Weighted Average Remaining Contractual Term (in years), Outstanding, March 31, 2015	3 years 5 months 5 days
Weighted Average Remaining Contractual Term (in years), Vested or expected to vest at March 31, 2015	3 years 5 months 5 days
Weighted Average Remaining Contractual Term (in years), Exercisable at March 31, 2015	2 years 8 months 1 day
Aggregate Intrinsic Value, Outstanding, March 31, 2015	$ 1,519
Aggregate Intrinsic Value, Vested or expected to vest at March 31, 2015	1,519
Aggregate Intrinsic Value, Exercisable at March 31, 2015	$ 1,470