Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended		36 Months Ended
	Aug. 24, 2019	Sep. 30, 2017	Aug. 26, 2017	Apr. 01, 2017	Feb. 25, 2017	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	44,500	240,933	4,490	173,288	900,997	44,500	1,319,708	1,364,208
Average Price Paid Per Share	$ 44.83	$ 46.30	$ 47.92	$ 49.92	$ 49.70			$ 48.96
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program						$ 87,000		$ 87,000
Publicly Announced Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	44,500	240,933	4,490	173,288	900,997			1,364,208
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program						$ 86,710		$ 86,710