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Equity Transactions (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders Equity [Line Items] |  |  |
Preferred stock, shares authorized | 10,000 | 10,000 |
Expiration date on repurchase authorizations | Dec. 31, 2020 |  |
Common stock acquired, shares | 376 |  |
Common stock acquired, cost | $ 35,786 | $ 9,606 | $ 1,510
Remaining authorized repurchase amount | 52,316 |  |
Maximum |  |  |
Stockholders Equity [Line Items] |  |  |
Authorization amount for repurchase of common stock | $ 175,000 |  |

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