Equity and Equity Compensation Plans - Compensation Costs for PSU's (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total expense	$ 13,110	$ 11,348	$ 39,438	$ 25,764
Performance Restricted Stock Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total expense			4,465	(126)
Performance Restricted Stock Units | Current Period
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total expense			4,465	(610)
Performance Restricted Stock Units | Prior Periods
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total expense			$ 0	$ 484