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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Mar. 08, 2019	Feb. 22, 2019	Feb. 11, 2019	Feb. 07, 2019	Jan. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 11, 2019
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses						$ 25,920	$ 0	$ 0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared				Feb. 07, 2019
Quarterly dividend, value per share				$ 0.17
Quarterly dividend, date to be paid	Mar. 08, 2019
Quarterly dividend, date of record		Feb. 22, 2019
Quarterly dividend, amount declared	$ 23,000
Total purchase price			$ 385,000		$ 200,000
Letter of Credit									$ 245,300