Income Taxes - Operating Loss Carryforwards (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 4,200,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards		$ 938,500,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		72,600,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		865,900,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 62,900,000	$ 54,100,000