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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock and Treasury Stock (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | 44,202,503 | 43,451,000 | 42,651,000
Balance at the beginning of the period (in shares) | (7,814,701) |  |
Restricted stock shares and restricted stock units (in shares) | 141,000 | 264,000 | 457,000
Other (in shares) | 688,000 | 488,000 | 343,000
Balance at the end of the period (in shares) | 45,032,325 | 44,202,503 | 43,451,000
Balance at the end of the period (in shares) | (7,672,648) | (7,814,701) |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Authorized shares (in shares) | 200,000,000.0 |  |
Par value (in dollars per share) | $ 0.01 |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | 52,017,000.000 | 51,529,000 | 51,186,000
Restricted stock shares and restricted stock units (in shares) | 0 | 0 | 0
Other (in shares) | 688,000 | 488,000 | 343,000
Balance at the end of the period (in shares) | 52,705,000 | 52,017,000.000 | 51,529,000
Common Stock In Treasury |  |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |
Balance at the beginning of the period (in shares) | (7,814,000) | (8,078,000.000) | (8,535,000)
Restricted stock shares and restricted stock units (in shares) | 141,000 | 264,000 | 457,000
Other (in shares) | 0 | 0 | 0
Balance at the end of the period (in shares) | (7,673,000) | (7,814,000) | (8,078,000.000)

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