Stock Compensation Plans (Details 1) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Options outstanding, January 1, 2015	173,720
Options Outstanding, Forfeited or cancelled	(5,100)
Options Outstanding, Exercised	(81,800)
Options Outstanding, Granted	6,250
Options outstanding, September 30, 2015	93,070
Options Outstanding, Vested or expected to vest at September 30, 2015	93,070
Options Outstanding, Exercisable at September 30, 2015	78,420
Weighted Average Exercise Price, Outstanding, January 1, 2015 | $ / shares	$ 20.8
Weighted Average Exercise Price, Forfeited or cancelled | $ / shares	25.36
Weighted Average Exercise Price, Exercised | $ / shares	22
Weighted Average Exercise Price, Granted | $ / shares	32.94
Weighted Average Exercise Price, Outstanding, September 30, 2015 | $ / shares	20.32
Weighted Average Exercise Price, Vested or expected to vest at September 30, 2015 | $ / shares	20.32
Weighted Average Exercise Price, Exercisable at September 30, 2015 | $ / shares	$ 18.6
Weighted Average Remaining Contractual Term (in years), Outstanding, September 30, 2015	3 years 6 months 14 days
Weighted Average Remaining Contractual Term (in years), Vested or expected to vest at September 30, 2015	3 years 6 months 14 days
Weighted Average Remaining Contractual Term (in years), Exercisable at September 30, 2015	2 years 6 months 22 days
Aggregate Intrinsic Value, Outstanding, September 30, 2015 | $	$ 1,512
Aggregate Intrinsic Value, Vested or expected to vest at September 30, 2015 | $	1,512
Aggregate Intrinsic Value, Exercisable at September 30, 2015 | $	$ 1,409