Summary of Significant Accounting Policies Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Interest Expense		$ 26,370	$ 25,079	$ 10,836
Reclassification From Construction In Progress To Property Plant And Equipment [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation	$ 1,500		800
Interest Expense	$ 700		$ 400
Reduction in Income before Income Taxes [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Results of Operations, Income before Income Taxes		$ 300