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Earnings per Share and Equity Transactions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Aug. 15, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001
Repurchase of common stock |  | $ (99,231) |
Dutch Auction |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program amount authorized | $ 75,000 |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |
Percent increase in shares authorized for repurchase | 2.00% |  |
Increase in shares authorized for repurchase | 10,706,774 |  |
Increase in authorized stock repurchase amount | $ 22,500 |  |
Shares acquired | 46,503,539 |  |
Average cost paid per share (in usd per share) | $ 2.10 |  |
Shares repurchased as a percentage of outstanding shares | 6.00% |  |

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