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Equity - Other share-based awards under the SIP (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other share-based awards under the SIP |  |  |
Amount of Directors' retainer paid in stock | $ 120 |  |
Percentage of additional Directors' retainer paid in stock | 50.00% |  |
Total share-based compensation expense included in net income | $ 23,000 | $ 18,000 | $ 21,000
Restricted stock units (RSUs) | Director |  |  |
Other share-based awards under the SIP |  |  |
Minimum period over which deferred shares may be transferred after director's termination of service | 6 months |  |
Total share-based compensation expense included in net income | $ 2,000 | $ 1,000 | $ 1,000
Awards outstanding (in shares) | 232 |  |
Carrying value of share units outstanding | $ 15,000 |  |

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- Definition Minimum period over which deferred shares may be transferred after grantee's termination of service. + References No definition available. + Details
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