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Earnings Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share Reconciliation [Abstract]  
Earnings Per Share Earnings Per Share
The following table presents a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations:
Year Ended December 31,
 202020192018
 Income
(Numerator)		Weighted
Shares
(Denominator)		Per-Share
Amount		Income
(Numerator)		Weighted
Shares
(Denominator)		Per-Share
Amount		Loss
(Numerator)		Weighted
Shares
(Denominator)		Per-Share
Amount
 (Amounts and numbers in thousands, except per-share data)
Basic EPS
Income (loss) available to common stockholders$374,607 55,358 $6.77 $320,087 55,351 $5.78 $(5,728)55,335 $(0.10)
Effect of dilutive securities:
Options— — — 9 — — 
Diluted EPS
Income (loss) available to common stockholders after assumed conversions$374,607 55,358 $6.77 $320,087 55,360 $5.78 $(5,728)55,335 $(0.10)

Potentially dilutive securities representing approximately 67,500, 0, and 78,500 shares of common stock for 2020, 2019, and 2018, respectively, were excluded from the computation of diluted earnings (loss) per common share because their effect would have been anti-dilutive. For the year ended December 31, 2018, the dilutive impact of incremental shares was excluded as the Company generated a net loss.