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Earnings Per Share (Tables)
12 Months Ended
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)202020192018
Income attributable to common stockholders:
Net income (loss)$82,019 $(267,931)$(528,258)
Weighted average shares outstanding - basic183,498 185,907 187,468 
Effect of dilutive securities - Unvested restricted stock, restricted stock units, and warrants888 — — 
Weighted average shares outstanding - diluted184,386 185,907 187,468 
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 units6.86.45.6
Performance-based restricted stock and restricted stock units1.61.10.8
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.