Income Taxes - Current and Deferred (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
State	$ (2,020)	$ 318	$ 1,811
Current Income Tax Expense (Benefit), Total	(7,430)	55,625	2,388
Deferred:
State	1,799	3,222	(113)
Deferred Income Tax Expense (Benefit), Total	64,716	35,951	76,881
Total income tax expense (benefit)	57,286	91,576	79,269
United States
Current:
U.S. federal	(39,268)	1,210	(32,351)
Deferred:
U.S. federal	67,909	58,157	37,476
Outside the U.S
Current:
Outside the U.S.	33,858	54,097	32,928
Deferred:
Outside the U.S.	$ (4,992)	$ (25,428)	$ 39,518