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Stock Incentive Plans - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Awards expected to vest in 2021 (in shares) | 244,490 |  |
Awards expected to vest in 2022 (in shares) | 139,307 |  |
Awards expected to vest in 2023 (in shares) | 173,476 |  |
Unrecognized compensation cost | $ 3,300,000 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 24 months |  |
Compensation expense | $ 2,600,000 | $ 2,600,000 | $ 3,100,000
Number of shares, vested (in shares) | 237,866 | 310,117 | 287,148
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Awards expected to vest in 2021 (in shares) | 290,927 |  |
Awards expected to vest in 2022 (in shares) | 269,224 |  |
Awards expected to vest in 2023 (in shares) | 352,035 |  |
Unrecognized compensation cost | $ 3,400,000 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 22 months |  |
Compensation expense | $ 2,700,000 | $ 2,400,000 | $ 1,900,000
Performance period (in years) | 3 years |  |
Percentage of target award of maximum possible payout to executives | 150.00% |  |
Compensation expense, forfeitures |  |  | $ 1,000,000.0
Number of shares, vested (in shares) | 245,937 | 251,375 | 218,514
Performance Shares | Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of total stockholder return for payout of shares | 30.00% |  |
Percentage of target award of maximum possible payout to executives | 150.00% |  |
Long-Term Incentive Plan Unit |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards expected to vest in 2021 (in shares) | 108,421 |  |
Awards expected to vest in 2022 (in shares) | 108,422 |  |
Awards expected to vest in 2023 (in shares) | 26,966 |  |
Unrecognized compensation cost | $ 1,600,000 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 18 months |  |
Compensation expense | $ 1,100,000 | $ 700,000 | $ 0
Number of shares, vested (in shares) | 81,455 |  |
2016 Equity Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option and Incentive plan, shares authorized (in shares) | 6,082,664 |  |
Number of shares issued or committed to issue (in shares) | 3,054,825 |  |
Maximum | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of total stockholder return for payout of shares | 30.00% |  |
Minimum | Performance Shares | Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of total stockholder return for payout of shares | 75.00% |  |

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