Stock Benefit Plans - Summary of Stock, Restricted Stock, and Restricted Stock Unit Activity (Details) - Long Term Incentive Plan - Stock, Restricted Stock and Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Non-vested balance at the beginning of the period (in shares)	62
Granted (in shares)	1,569
Vested (in shares)	(50)
Forfeited (in shares)	(121)
Canceled (in shares)	0
Non-vested balance at the end of the period (in shares)	1,460	62
Weighted Average Grant Date Fair Value Per Share ($)
Non-vested balance at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 48.29
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	18.86	$ 48.29	$ 63.80
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	40.19
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	19.01
Canceled (in dollars per share)	0
Non-vested balance at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 19.37	$ 48.29