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Performance Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  |  |  | 1,800,000
Stock options outstanding (in shares) | 0 |  |  |
Stock options exercisable (in shares) | 0 |  |  |
Restricted shares granted (in shares) | 28,127 |  |  |
Share-based compensation cost | $ 10,737 | $ 9,282 | $ 12,971 |
Unrecognized compensation cost | $ 16,877 |  |  |
Weighted average period for recognition of unrecognized compensation cost | 2 years 3 months 18 days |  |  |
Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares granted (in shares) | 364,769 |  |  |
Restricted stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 3 years |  |  |
Restricted stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 5 years |  |  |
Performance shares, subject to shareholder return |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares granted (in shares) | 144,345 |  |  |
Performance period used In calculation | 3 years |  |  |
Fair value share price (in dollars per share) | $ 27.61 |  |  |
Performance shares, subject to Core Funds From Operations growth |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares granted (in shares) | 48,116 |  |  |
Performance period used In calculation | 3 years |  |  |
Weighted average grant price (in dollars per share) | $ 53.70 |  |  |

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