Employee Benefit Obligations - Net Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$ 6,223
Interest cost	64	$ 47
Company service cost	498	312
Employee contributions	321	189
Prior service cost		158
Benefits paid	422	4,023
Actuarial loss	713	1,494
Projected benefit obligation at end of year	8,241	6,223
Change in Plan Assets
Fair value of plan assets at beginning of year	4,433
Actual return on plan assets	320	(63)
Employer contributions	482	284
Employee contributions	321	189
Benefits paid	422	4,023
Fair value of plan assets at end of year	5,978	4,433
Funded Status at End of year
Excess of obligation over assets	(2,263)	(1,790)
Change in Accrued Benefit Liability
Accrued benefit asset/(liability) at beginning of year	(1,790)
Company contributions made during year	482	284
Net periodic benefit cost for year	(529)	(404)
Net decrease in accumulated other comprehensive loss	(426)	(1,670)
Accrued benefit liability at end of year	(2,263)	(1,790)
Non - current plan assets	5,979	4,433
Non - current liability	8,242	6,223
Accrued benefit liability at end of year	(2,263)	(1,790)
Projected Benefit Payments
Projected year 1	148	8
Projected year 2	150	13
Projected year 3	152	19
Projected year 4	155	25
Projected year 5	1,069	32
Projected year 6-10	$ 928	$ 264