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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		2 Months Ended	12 Months Ended			26 Months Ended
	Jan. 04, 2015	Dec. 31, 2016	Nov. 30, 2016	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	82,100	103,658	179,685	680,813	283,343	82,100	680,813	1,046,256
Average Price Paid Per Share	$ 34.57	$ 50.00	$ 49.11	$ 35.22				$ 39.06
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program		$ 59,000			$ 59,000			$ 59,000
Publicly Announced Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	82,100	103,658	179,685	680,813				1,046,256
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program		$ 58,982			$ 58,982			$ 58,982