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Earnings (Loss) Per Share and Equity Transactions - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 17, 2017 | Dec. 01, 2016 | Dec. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tender Offer Event [Line Items] |  |  |  |  |  |
Refund received of excess funds associated with 2016 tender offer | $ 1,929,000 |  |  | $ 1,929,000 | $ 0 | $ 0
Tender Offer Event, Shares [Member] |  |  |  |  |  |
Tender Offer Event [Line Items] |  |  |  |  |  |
Tender offer purchase price |  |  | $ 200,000,000.0 |  |  |
Allowed percentage of additional shares accepted for repurchase without amendment of offer (percent) |  |  | 2.00% |  |  |
Increase tender offer (shares) |  |  | 14,186,716 |  |  |
Refund received of excess funds associated with 2016 tender offer |  |  | $ 37,700,000 |  |  |
Repurchase of common stock (shares) |  | 89,502,449 |  |  |  |
Share price (usd per share) |  | $ 2.66 | $ 2.66 |  |  |
Tender offer purchase price, excluding fees and expenses |  | $ 238,077,000 |  |  |  |
Ratio of shares repurchased to shares outstanding (percent) |  | 10.40% | 10.40% |  |  |

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