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Stockholders' Equity - Incentive and Other (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 6 Months Ended | 147 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Aug. 10, 2018 | Mar. 29, 2007
Share Repurchase Program |  |  |  |  |
Share repurchase | $ 7,897 | $ 6,830 |  |  |
Stock Repurchase Program 2007 |  |  |  |  |
Share Repurchase Program |  |  |  |  |
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program | 8.8 |  | 8.8 | 0.7 | 1.0
Share repurchase (in shares) | 0.2 |  | 8.4 |  |
Average price (in dollars per share) | $ 49.09 |  | $ 16.87 |  |
Share repurchase | $ 7,900 |  |  |  |

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