Income Taxes - US Tax Act of 2017 (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
US Tax Act of 2017 [Abstract]
New Corporate Tax Rate		21.00%
Decrease in Deferred Tax Assets		$ 64,440,000
Decrease in Deferred Tax Liabilities		20,034,000
Decrease in Valuation Allowance		45,986,000
Deferred Tax Benefit Adjustment, net	$ 2,023,000	$ 1,580,000