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Net Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share [Text Block] | Net Income (Loss) Per Share The following table presents the computation of net income (loss) per share on a basic and diluted basis for the years ended December 31 (shares in thousands):
|  | 2020 |  | 2019 |  | 2018 |
Net income (loss) attributable to shareholders |  | $ | 584,438 |  |  | $ | (204,087) |  |  | $ | 716,195 |  |
Weighted-average shares outstanding - basic |  | 77,992 |  |  | 83,568 |  |  | 87,476 |  |
Net effect of various dilutive stock-based compensation awards |  | 643 |  |  | — |  |  | 968 |  |
Weighted-average shares outstanding - diluted |  | 78,635 |  |  | 83,568 |  |  | 88,444 |  |
Net income (loss) per share: |  |  |  |  |  |  |
Basic |  | $ | 7.49 |  |  | $ | (2.44) |  |  | $ | 8.19 |  |
Diluted (a) |  | $ | 7.43 |  |  | $ | (2.44) |  |  | $ | 8.10 |  |
(a)Stock-based compensation awards for the issuance of 1,143 shares, 1,614 shares, and 651 shares for the years ended December 31, 2020, 2019, and 2018, respectively, were excluded from the computation of net income (loss) per share on a diluted basis as their effect was anti-dilutive. As the company reported a net loss attributable to shareholders for 2019, basic and diluted net loss per share attributable to shareholders are the same.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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