Equity (Details 5)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number outstanding	776,171
Options outstanding weighted average remaining contractual life	3 years 11 months 23 days
Options exercisable	290,811
Exercise Price Range One [Member]
Exercise price range, minimum | $ / shares	$ 23.61
Exercise price range, maximum | $ / shares	$ 29.36
Number outstanding	209,920
Options outstanding weighted average remaining contractual life	2 years 5 months 23 days
Options exercisable	134,170
Exercise Price Range Two [Member]
Exercise price range, minimum | $ / shares	$ 32.83
Exercise price range, maximum | $ / shares	$ 35.75
Number outstanding	206,101
Options outstanding weighted average remaining contractual life	2 years 10 months 6 days
Options exercisable	123,781
Exercise Price Range Three Member]
Exercise price range, minimum | $ / shares	$ 40.15
Exercise price range, maximum | $ / shares	$ 46.90
Number outstanding	177,800
Options outstanding weighted average remaining contractual life	4 years 11 months 16 days
Options exercisable	32,860
Exercise Price Range Four Member]
Exercise price range, minimum | $ / shares	$ 65.25
Number outstanding	182,350
Options outstanding weighted average remaining contractual life	6 years
Options exercisable