Employee Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Contributory retirement (401(k)) savings plans
Company contributions	$ 185	$ 174	$ 184
Plan
Employee retirement plan
Comprehensive income (loss), net of tax		602	(81)
Comprehensive income (loss), tax expense (benefit)		344	(46)
Contributions by the entity		233	0
Change in projected benefit obligation:
Interest cost		44	87
Change in plan assets:
Employer contribution		233	0
Funded status
Projected benefit obligation, pre-settlement				$ 2,039
Projected benefit obligation, settlement				(2,039)
Fair value of plan assets, pre-settlement				2,039
Fair value of plan assets, settlement				$ (2,039)
Components of the net periodic benefit cost
Interest cost		44	87
Expected return on plan assets		(18)	(38)
Amortization of net actuarial loss		65	65
Net periodic benefit cost		91	114
Settlement charge		814
Total net periodic benefit cost		$ 905	$ 114