Contract Assets and Contract Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Contract Assets, Beginning	$ 0
Opening Balance Adjustment	56
FY 2018 Opening Balance	56
Reductions(1)	(314)
Additions(2)	314
Dec. 31, 2018	56
Net Contract Assets (Liabilities)	(314)
Opening Balance Adjustment	164
FY 2018 Opening Balance	(150)
Reductions(1)	(35)
Additions(2)	(34)
Net Contract Assets (Liabilities)	(219)
Open Projects
Contract Liabilities, Beginning	186
Opening Balance Adjustment	(108)
FY 2018 Opening Balance	78
Reductions(1)	(154)
Additions(2)	177
Contract Liabilities, Ending	101
Other Customer Deposits
Contract Liabilities, Beginning	128
Opening Balance Adjustment	0
FY 2018 Opening Balance	128
Reductions(1)	(125)
Additions(2)	171
Contract Liabilities, Ending	$ 174