Closure Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Closure Costs
Closure Costs Incurred for the Period	$ 2,385
Cash Payments for the Period	(1,414)
Non-cash adjustments for the period	(400)
Closure Costs Liability, Ending Balance	571
Severance
Closure Costs
Closure Costs Incurred for the Period	706
Cash Payments for the Period	(270)
Non-cash adjustments for the period	(285)
Closure Costs Liability, Ending Balance	151
Lease abandonment
Closure Costs
Closure Costs Incurred for the Period	582
Cash Payments for the Period	(105)
Non-cash adjustments for the period	(115)
Closure Costs Liability, Ending Balance	362
Other costs
Closure Costs
Closure Costs Incurred for the Period	1,097
Cash Payments for the Period	(1,039)
Closure Costs Liability, Ending Balance	$ 58