Per Share Data (Computations of Basic and Diluted Per Share) (Details) - shares |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Earnings Per Share [Abstract] | |||||||||||
| Basic weighted-average common shares outstanding - basic (in shares) | 189,463,849 | 196,381,910 | 196,557,837 | 195,898,794 | 194,749,001 | 192,912,643 | 192,304,828 | 192,270,615 | 194,562,916 | 193,064,550 | 182,987,850 |
| Effect of dilutive securities: | |||||||||||
| Options to purchase common stock (in shares) | 0 | 0 | 0 | ||||||||
| Restricted shares (in shares) | 0 | 0 | 0 | ||||||||
| Dilutive potential common shares (in shares) | 0 | 0 | 0 | ||||||||
| Weighted average common shares outstanding and dilutive potential common shares (in shares) | 198,743,096 | 208,387,236 | 209,855,936 | 195,898,794 | 194,749,001 | 192,912,643 | 192,304,828 | 192,270,615 | 194,562,916 | 193,064,550 | 182,987,850 |
| X | ||||||||||
- Definition The number of share issuable under various common stock option plans. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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