Basis of Accounting and Consolidation Basis of Accounting and Consolidation (ATM) (Details) - At The Market Program [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Aug. 16, 2017
Balance of Common Stock Available Under ATM	$ 16,660	$ 20,000
Stock Issued During Period, Shares, New Issues	95,310
Weighted Average Price of Shares Issued During Period	$ 35.06
Stock Issued During Period, Value, New Issues	$ 3,340
Stock Issued During Period, Value, Net Of Issuance Costs	$ 3,280