Long Term Debt - Term Loan Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Interest expense - amortization of deferred financing costs	$ 6,650	$ 0	$ 30
Term Loan | BT Loan Agreement
Debt Instrument [Line Items]
Interest expense - stated interest rate	4,331
Interest expense - amortization of original issue discount	360
Interest expense - amortization of deferred financing costs	1,071
Total term loan interest expense	$ 5,762