Equity (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Repurchases [Abstract]
Number of Shares Authorized to be Repurchased	3,200
Treasury Stock, Shares, Acquired	100	0
Dividends, Common Stock, Cash	$ 1.7	$ 1.7