XML 69 R56.htm IDEA: XBRL DOCUMENT

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	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	240,933	4,490	173,288	900,997	283,343	82,100	1,319,708	283,343	82,100	1,685,151
Average Price Paid Per Share	$ 46.30	$ 47.92	$ 49.92	$ 49.70	$ 49.43	$ 34.57				$ 48.45
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program							$ 31,000			$ 31,000
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	82,100				1,685,151
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program							$ 30,710			$ 30,710