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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 09, 2018 | Apr. 05, 2018 | Mar. 15, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.035 | $ 0.035 | $ 0.858 |  |
Payments of dividends |  |  |  | $ 0 | $ 550,000 |  |
Reclassification from AOCI |  |  |  | 0 |  |  |
Accumulated deficit |  |  |  | (1,148,059) |  | $ (963,782) | $ (998,212)
Subsequent Event |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.035 |  |  |  |  |  |
Common stock dividends paid (in dollars per share) |  | $ 0.035 |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ 39,535 |  | $ 34,430 |

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