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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended	12 Months Ended		36 Months Ended
	Sep. 30, 2017	Aug. 26, 2017	Apr. 01, 2017	Feb. 25, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	240,933	4,490	173,288	900,997	283,343	1,319,708	283,343	1,603,051
Average Price Paid Per Share	$ 46.30	$ 47.92	$ 49.92	$ 49.70	$ 49.43			$ 49.16
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program									$ 89,000
Publicly Announced Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	240,933	4,490	173,288	900,997	283,343			1,603,051
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program						$ 88,710		$ 88,710

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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Number of shares that have been repurchased during the period and are being held in treasury.

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-Topic 505
-SubTopic 10
-Section 50
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