Debt - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Exchange agreement, aggregate principal amount		$ 247,200			$ 247,200
Shares authorized for issuance (in shares)		44.0			44.0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Exchange agreement, accrued and unpaid interest					$ 1,300
Gain (loss) on extinguishment of debt, additional paid-in capital		$ 215,000			215,000
Gain (loss) on extinguishment of debt, fair value of common shares issued		400			400
Loss on exchange of convertible debt	$ 0	$ 4,501	$ 36,100	$ 0	40,624
Proceeds from termination of capped call confirmations				$ 0	$ 19,875