Stock-Based Compensation (Details 2)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
$11.45 to $20.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	241,854
Options Outstanding, Average Remaining Life (Years)	4 years 2 months 1 day
Options Outstanding, Average Exercise Price	$ 16.41
Options Exercisable, Number of Shares | shares	241,854
Options Exercisable, Average Exercise Price	$ 16.41
Range of Exercise Prices, Lower Range Limit	11.45
Range of Exercise Prices, Upper Range Limit	$ 20.69
$22.34 to $26.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	191,116
Options Outstanding, Average Remaining Life (Years)	4 years 8 months 19 days
Options Outstanding, Average Exercise Price	$ 25.00
Options Exercisable, Number of Shares | shares	143,153
Options Exercisable, Average Exercise Price	$ 25.14
Range of Exercise Prices, Lower Range Limit	22.34
Range of Exercise Prices, Upper Range Limit	$ 26.59
$33.45 to $36.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	121,800
Options Outstanding, Average Remaining Life (Years)	8 years 11 months 27 days
Options Outstanding, Average Exercise Price	$ 36.26
Options Exercisable, Number of Shares | shares	2,000
Options Exercisable, Average Exercise Price	$ 33.45
Range of Exercise Prices, Lower Range Limit	33.45
Range of Exercise Prices, Upper Range Limit	$ 36.31
$37.13 to $38.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	89,302
Options Outstanding, Average Remaining Life (Years)	8 years 3 months 11 days
Options Outstanding, Average Exercise Price	$ 37.43
Options Exercisable, Number of Shares | shares	26,726
Options Exercisable, Average Exercise Price	$ 37.26
Range of Exercise Prices, Lower Range Limit	37.13
Range of Exercise Prices, Upper Range Limit	$ 38.96