Stock-Based Compensation (Details 2)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
$11.45 to $15.83
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	87,690
Options Outstanding, Average Remaining Life (Years)	2 years 6 months 29 days
Options Outstanding, Average Exercise Price	$ 13.48
Options Exercisable, Number of Shares | shares	87,690
Options Exercisable, Average Exercise Price	$ 13.48
Range of Exercise Prices, Lower Range Limit	11.45
Range of Exercise Prices, Upper Range Limit	$ 15.83
$20.69 to $24.24
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	76,584
Options Outstanding, Average Remaining Life (Years)	5 years 1 month 6 days
Options Outstanding, Average Exercise Price	$ 22.65
Options Exercisable, Number of Shares | shares	76,584
Options Exercisable, Average Exercise Price	$ 22.65
Range of Exercise Prices, Lower Range Limit	20.69
Range of Exercise Prices, Upper Range Limit	$ 24.24
$26.32 to $30.71
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	214,312
Options Outstanding, Average Remaining Life (Years)	7 years 5 months 27 days
Options Outstanding, Average Exercise Price	$ 29.27
Options Exercisable, Number of Shares | shares	72,312
Options Exercisable, Average Exercise Price	$ 26.43
Range of Exercise Prices, Lower Range Limit	26.32
Range of Exercise Prices, Upper Range Limit	$ 30.71
$33.45 to $38.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	210,574
Options Outstanding, Average Remaining Life (Years)	7 years 10 months 28 days
Options Outstanding, Average Exercise Price	$ 36.57
Options Exercisable, Number of Shares | shares	82,350
Options Exercisable, Average Exercise Price	$ 36.83
Range of Exercise Prices, Lower Range Limit	33.45
Range of Exercise Prices, Upper Range Limit	$ 38.96