Shareholders' Equity and Common Stock Equivalents (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of changes in outstanding options
Weighted Average Option Price per Share, Beginning Balance	$ 24.00
Weighted Average Option Price per Share, Options Granted	31.13
Weighted Average Option Price per Share, Options Vested	22.73
Weighted Average Option Price per Share, Options Exercised	17.02
Weighted Average Option Price per Share, Options Forfeited	27.53
Weighted Average Option Price per Share, Options Expired	0
Weighted Average Option Price per Share, Ending Balance	$ 27.67	$ 24.00
Options Outstanding, Beginning Balance	669,693	634,437
Options Outstanding, Granted	307,176	142,908	175,632
Options Outstanding, Vested	0
Options Outstanding, Exercised	(146,278)
Options Outstanding, Forfeited	(83,559)
Options Outstanding, Expired	0
Options Outstanding, Ending Balance	747,032	669,693	634,437
Options Vested and Exercisable, Beginning Balance	281,632
Options Vested and Exercisable, Granted	0
Options Vested and Exercisable, Vested	137,763
Options Vested and Exercisable, Exercisable	(146,278)
Options Vested and Exercisable, Forfeited	0
Options Vested and Exercisable, Expired	0
Options Vested and Exercisable, Ending Balance	273,117	281,632
Minimum [Member]
Summary of changes in outstanding options
Weighted Average Option Price per Share, Ending Balance	$ 13.83
Range of Option Prices per Share, Beginning Balance	6.91
Range of Option Prices per Share, Granted	31.01
Range of Option Prices per Share, Vested	13.83
Range of Option Prices per Share, Exercised	6.91
Range of Option Prices per Share, Forfeited	17.32
Range of Option Prices per Share, Expired	0
Range of Option Prices per Share, Ending Balance	13.83	$ 6.91
Maximum [Member]
Summary of changes in outstanding options
Weighted Average Option Price per Share, Ending Balance	36.04
Range of Option Prices per Share, Beginning Balance	33.41
Range of Option Prices per Share, Granted	36.04
Range of Option Prices per Share, Vested	36.04
Range of Option Prices per Share, Exercised	33.41
Range of Option Prices per Share, Forfeited	32.35
Range of Option Prices per Share, Expired	0
Range of Option Prices per Share, Ending Balance	$ 36.04	$ 33.41