Senior Notes - Carrying Amount of Senior Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying Amount	$ 1,384,714	$ 1,037,391
5.500% Senior Notes due January 2024, net
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Carrying Amount	$ 249,352	249,233
3.850% Senior Notes due January 2030, net
Debt Instrument [Line Items]
Interest rate, stated percentage	3.85%
Carrying Amount	$ 297,577	297,458
2.500% Senior Notes due January 2031, net
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Carrying Amount	$ 346,985	0
6.000% Senior Notes due January 2043, net
Debt Instrument [Line Items]
Interest rate, stated percentage	6.00%
Carrying Amount	$ 490,800	$ 490,700