Investments Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entity, Qualitative or Quantitative Information, Date Involvement Began			Sep. 25, 2017
Variable Interest Entity, Financial or Other Support, Amount			$ 200,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			66.70%
Variable Interest Entity, Measure of Activity, Other, Amount			$ 22,300
Variable Interest Entity, Measure of Activity, Purchases			22,300
Net loss (income) in earnings of equity method investment	$ (3,481)	$ (610)	126	$ (3,581)
Proceeds from Equity Method Investment, Distribution, Return of Capital	10,300		10,288	0
Management Fee Expense	800	$ 800	2,300	$ 3,700
Equity Method Investments	43,367		43,367		$ 31,151
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 43,367		$ 43,367		$ 31,151