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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table summarizes the computation of basic and diluted earnings (loss) per share amounts presented in the consolidated financial statements.
| Years Ended December 31,
(in thousands, except for per share amounts) | 2020 |  | 2019 |  | 2018
Income attributable to common stockholders: |  |  |  |  |
Net income (loss) | $ | 82,019 |  |  | $ | (267,931) |  |  | $ | (528,258) |
Weighted average shares outstanding - basic | 183,498 |  |  | 185,907 |  |  | 187,468 |
Effect of dilutive securities - Unvested restricted stock, restricted stock units, and warrants | 888 |  |  | — |  |  | — |
Weighted average shares outstanding - diluted | 184,386 |  |  | 185,907 |  |  | 187,468 |
Basic earnings (loss) per common share: |  |  |  |  |
Net income (loss) per share attributable to common stockholders | $ | 0.45 |  |  | $ | (1.44) |  |  | $ | (2.82) |
Diluted earnings (loss) per common share: |  |  |  |  |
Net income (loss) per share attributable to common stockholders | $ | 0.44 |  |  | $ | (1.44) |  |  | $ | (2.82) |
Schedule of Potentially Dilutive Securities | The following potentially dilutive securities were excluded from the computation of diluted EPS:
| Years Ended December 31, |
(in millions) | 2020 |  | 2019(1) |  | 2018(1) |
Non-performance-based restricted stock and restricted stock units | 6.8 |  | 6.4 |  | 5.6 |
Performance-based restricted stock and restricted stock units | 1.6 |  | 1.1 |  | 0.8 |
Warrants(2) | — |  |  | — |  |  | 0.5 |
(1)As a result of the net loss reported for the period, all unvested restricted stock, restricted stock units, convertible debt instruments, and potential shares issuable under warrants were antidilutive for the period and as such were not included in the computation of diluted weighted average shares outstanding. (2)The option to exercise the warrants to acquire the Company's common stock outstanding at December 31, 2018 expired unexercised in 2019.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258 + Details
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