Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Treasury stock, shares, acquired	30,298
Treasury stock, value	$ 3.3
Treasury shares, acquired, tax burden	10,298
Treasury shares, acquired, value, tax burden	$ 1.1
Treasury stock reissued	35,686
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.55
Dividends declared (in dollars per share)	$ 0.55