Fair Value Measurements - Estimated Fair Value of Senior Notes (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	$ 1,384,714,000	$ 1,037,391,000
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	1,384,714,000	1,037,391,000
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,562,900,000	1,274,135,000
$250 million 5.500% Senior Notes due January 2024, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 250,000,000
Interest rate, stated percentage	5.50%
Carrying Amount	$ 249,352,000	249,233,000
$250 million 5.500% Senior Notes due January 2024, net | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	249,352,000	249,233,000
$250 million 5.500% Senior Notes due January 2024, net | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	274,650,000	275,463,000
$300 million 3.850% Senior Notes due January 2030, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 300,000,000
Interest rate, stated percentage	3.85%
Carrying Amount	$ 297,577,000	297,458,000
$300 million 3.850% Senior Notes due January 2030, net | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	297,577,000	297,458,000
$300 million 3.850% Senior Notes due January 2030, net | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	322,725,000	331,384,000
$350 million 2.500% Senior Notes due January 2031, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 350,000,000
Interest rate, stated percentage	2.50%
Carrying Amount	$ 346,985,000	0
$350 million 2.500% Senior Notes due January 2031, net | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	346,985,000	0
$350 million 2.500% Senior Notes due January 2031, net | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	326,522,000	0
$500 million 6.000% Senior Notes due January 2043, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 500,000,000
Interest rate, stated percentage	6.00%
Carrying Amount	$ 490,800,000	490,700,000
$500 million 6.000% Senior Notes due January 2043, net | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	490,800,000	490,700,000
$500 million 6.000% Senior Notes due January 2043, net | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 639,003,000	$ 667,288,000