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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	3 Months Ended					6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Dividends and Noncontrolling Interest [Line Items]
Cash dividend paid (usd per share) | $ / shares		$ 1.00	$ 1.00		$ 0.75
Cash dividends	$ (224)		$ 190,533			$ 107,277	$ 271,201
Reduction to noncontrolling interest			2,727			998	2,727
WML
Dividends and Noncontrolling Interest [Line Items]
Company's share of dividend			215,000
Reduction to noncontrolling interest			83,000
Subsidiaries | WML
Dividends and Noncontrolling Interest [Line Items]
Cash dividend paid (usd per share) | $ / shares				$ 0.45
Cash dividends			298,000
Retained earnings (accumulated deficit)
Dividends and Noncontrolling Interest [Line Items]
Cash dividends	$ (208)	$ 107,500	$ 107,616		$ 80,700	$ 107,307	$ 188,301

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