Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate, percentage	18.00%	17.50%	29.40%	18.60%
AMT tax credit refund	$ 102,482,000		$ 102,482,000
Total amount of uncertain tax positions	33,243,000		33,243,000		$ 31,516,000
Unrecognized tax benefits that would impact effective tax rate	33,243,000		33,243,000		33,243,000
Accrued interest liability	$ 0		$ 0		$ 0