Income Taxes Operating loss carryforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 18,100
Deferred Tax Assets, Valuation Allowance	173,965	$ 171,456
Operating Loss Carryforwards		845,703
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	8,000	8,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	6,400	0
Operating Loss Carryforwards		1,600
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 167,600	171,500
Operating Loss Carryforwards		$ 6,500