Stock Compensation Plans (Details 1) - Jun. 30, 2015 - USD ($) $ / shares in Units, $ in Thousands	Total
Options outstanding, January 1, 2015	173,720
Options Outstanding, Forfeited or cancelled	(5,100)
Options Outstanding, Exercised	(78,050)
Options Outstanding, Granted	6,250
Options outstanding, June 30, 2015	96,820
Options Outstanding, Vested or expected to vest at June 30, 2015	96,820
Options Outstanding, Exercisable at June 30, 2015	82,170
Weighted Average Exercise Price, Outstanding, January 1, 2015	$ 20.8
Weighted Average Exercise Price, Forfeited or cancelled	25.36
Weighted Average Exercise Price, Exercised	22.01
Weighted Average Exercise Price, Granted	32.94
Weighted Average Exercise Price, Outstanding, June 30, 2015	20.37
Weighted Average Exercise Price, Vested or expected to vest at June 30, 2015	20.37
Weighted Average Exercise Price, Exercisable at June 30, 2015	$ 18.74
Weighted Average Remaining Contractual Term (in years), Outstanding, June 30, 2015	3 years 8 months 19 days
Weighted Average Remaining Contractual Term (in years), Vested or expected to vest at June 30, 2015	3 years 8 months 19 days
Weighted Average Remaining Contractual Term (in years), Exercisable at June 30, 2015	2 years 9 months 7 days
Aggregate Intrinsic Value, Outstanding, June 30, 2015	$ 1,661
Aggregate Intrinsic Value, Vested or expected to vest at June 30, 2015	1,661
Aggregate Intrinsic Value, Exercisable at June 30, 2015	$ 1,544