Senior Secured Notes	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Senior Secured Notes	Senior Secured Notes    On October 5, 2015, we completed the sale and issuance of $250.0 million in aggregate principal amount of 7.75% senior secured notes due 2020 (the Notes). The Notes bore interest at a rate of 7.75% per annum and were to mature on October 5, 2020. On April 13, 2020, we redeemed the Notes at par and therefore repaid the principal of $250.0 million and accrued interest of $4.8 million.