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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 10, 2017 | Aug. 11, 2016 | Apr. 25, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  | 240,000,000 | 240,000,000 |  |  |  |
Preferred stock, shares authorized |  | 5,000,000 |  |  |  |  |
Preferred stock, par value per share (in dollars per share) |  | $ 0.01 |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 96,547 | $ 0 | $ 0 |  |  |
April ATM Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Maximum value of common stock to be issued |  |  |  |  |  |  | $ 50,000
Value of common stock issued |  | 50,000 |  |  |  |  |
Net proceeds from issuance of common stock |  | 47,700 |  |  |  |  |
Payments for commissions |  | $ 1,300 |  |  |  |  |
April ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  | 6,309,355 |  |  |  |  |
Price per share issued (in dollars per share) |  | $ 7.92 |  |  |  |  |
August ATM Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Maximum value of common stock to be issued |  |  |  |  |  | $ 50,000 |
Value of common stock issued |  | $ 50,000 |  |  |  |  |
Net proceeds from issuance of common stock |  | 48,800 |  |  |  |  |
Payments for commissions |  | $ 1,000 |  |  |  |  |
August ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  | 6,709,377 |  |  |  |  |
Price per share issued (in dollars per share) |  | $ 7.45 |  |  |  |  |
Underwritten Public Equity Offering [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  |  | 26,450,000 |  |
Price per share issued (in dollars per share) |  |  |  |  | $ 8.65 |  |
Net proceeds from issuance of common stock | $ 220,000 |  |  |  |  |  |

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