Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common stock, shares authorized	100,000,000	60,000,000
At-The Market Shelf Registration, Equity Offering Sales Agreement, Aggregate Sales Price	$ 500,000
Stock Issued During Period, Shares, New Issues	535,990	1,209,522
Shares Issued, Price Per Share	$ 66.30
Proceeds from equity offering, net	$ 34,649	$ 95,774	$ 81,784
Authorized Shares, Prior to Charter Amendment [Member]
Common stock, shares authorized	60,000,000
Authorized Shares, After Charter Amendment [Member]
Common stock, shares authorized	100,000,000