Stock-Based Compensation (Details 4) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation [Abstract]
Options Outstanding, Expected to Vest, Shares | shares	666,162
Options Outstanding, Expected to Vest, Weighted-Average Exercise Price | $ / shares	$ 37.87
Options Outstanding, Expected to Vest, Aggregate Intrinsic Value | $	$ 11,113
Options Outstanding, Expected to Vest, Weighted-Average Remaining Term	6 years 4 months 13 days
Options Outstanding, Exercisable, Shares | shares	443,406
Options Outstanding, Exercisable, Weighted-Average Exercise Price | $ / shares	$ 31.73
Options Outstanding, Exercisable, Aggregate Intrinsic Value | $	$ 9,707
Options Outstanding, Exercisable, Weighted-Average Remaining Term	5 years 3 months 22 days