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Net (Loss) Income Per Common Share - Calculation of Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Numerator for diluted net (loss) income per share: |  |  |  |  |
Net (loss) income | $ (21,324) | $ 22,409 | $ (3,535) | $ 77,959 | $ 201,700
Less: Series B preferred stock dividends | (4,500) | (4,500) | (9,000) | (9,000) |
Less: undistributed earnings attributed to participating securities (diluted calculation) |  | (9,865) |  | (37,949) |
Diluted net (loss) income attributable to common stockholders | $ (25,824) | $ 8,044 | $ (12,535) | $ 31,010 |
Denominator for diluted net (loss) income per share: |  |  |  |  |
Weighted-average shares outstanding | 206,490,690 | 206,235,839 | 206,436,048 | 206,201,937 |
Weighted-average unvested restricted shares outstanding | (3,857,807) | (3,894,630) | (3,907,045) | (4,002,144) |
Effect of dilutive potential shares |  | 34,540,870 |  | 35,172,388 |
Denominator for diluted net (loss) income per share | 202,632,883 | 236,882,079 | 202,529,003 | 237,372,181 |
Diluted net (loss) income per share attributable to common stockholders | $ (0.13) | $ 0.03 | $ (0.06) | $ 0.13 |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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