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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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