Share-Based Compensation and Employee Ownership Plans SARs (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Weighted Average Exercise Price/Share
Closing stock price, in dollars per share			$ 13.65
Stock Appreciation Rights
Weighted Average Exercise Price/Share
Exercisable, weighted remaining contractual term		0 years
Equity Plans | Stock Appreciation Rights
Shares Subject to Option
Balance outstanding, beginning of period, shares		75,000
Acquired, shares		(75,000)
Balance outstanding, end of period, shares		0	75,000
Balance exercisable, shares		0
Weighted Average Exercise Price/Share
Balance outstanding, beginning of period, in dollars per share		$ 11.60
Acquired, in dollars per share		14.21
Balance outstanding, end of period, in dollars per share			$ 11.60
Balance exercisable, weighted shares		$ 0.00
Weighted Average Remaining Term Outstanding		0 years	2 months 16 days
Aggregate intrinsic value, outstanding	[1]	$ 0	$ 173

[1] Based on the Company's closing stock price of $13.65 on December 31, 2017.