Basis of Accounting and Consolidation Basis of Accounting and Consolidation (Stock Issuance) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jun. 15, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Aug. 16, 2017
Capital Raise [Abstract]
Common stock, par value (in dollars per share)		$ 4		$ 4
Proceeds from issuance of common stock		$ 216	$ 150
Capital Raise [Member]
Capital Raise [Abstract]
shares underwriters agreed to purchase		823,799
Shares Issued, Price Per Share	$ 38.00
Underwriters Option to Purchase Shares		123,569
Shares, Issued	947,368
Proceeds from issuance of common stock	$ 34,000
At The Market Program [Member]
Balance of Common Stock Available Under ATM		$ 16,530			$ 20,000