Employee Benefits Supplemental Executive Retirement Plans and Long Term Incentive Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation expense	$ (400)	$ 900	$ 600
Restructuring	7,828	0	2,017
Holding Company SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	7,300	7,900
Net periodic benefit cost	$ 7	$ 400	$ 500
Benefit obligation, discount rate	4.15%	3.60%	4.10%
Pacific Northwest SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 2,900	$ 3,200
Net periodic benefit cost	$ 200	$ 200	$ 200
Benefit obligation, discount rate	4.18%	3.37%	3.62%
KLS LTIP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 9,200	$ 8,100
Benefit obligation, discount rate	4.10%	3.33%	3.70%
Compensation expense	$ 1,600	$ 500	$ (200)
Restructuring	$ 800