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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 01, 2014 shares | Apr. 30, 2021 $ / shares shares | Feb. 28, 2021 installment company $ / shares shares | Jan. 31, 2021 installment $ / shares shares | Feb. 28, 2021 installment | Jun. 30, 2021 USD ($) shares | Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unamortized stock-based compensation expense related to unvested awards | $ |  |  |  |  |  | $ 13.2 |
Weighted average remaining vesting period related to expense recognition |  |  |  |  |  | 2 years 2 months 12 days |
Restricted stock award | Ensign employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock awards unvested during spin-off (in shares) | 207,580 |  |  |  |  |  |
Shares forfeited (shares) |  |  |  |  |  |  | 1,760
Unvested stock awards outstanding (in shares) |  |  |  |  |  | 0 |
Restricted stock award | Officers and employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 99,189 | 140,514 |  |  |
Award grant date fair value (in usd per share) | $ / shares |  |  | $ 22.18 | $ 22.48 |  |  |
Number of equal annual vesting installments | installment |  |  | 3 | 3 | 3 |  |
Restricted stock award | Board of Directors |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of awards granted (in shares) |  | 20,266 |  |  |  |  |
Award grant date fair value (in usd per share) | $ / shares |  | $ 24.18 |  |  |  |  |
Performance stock award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Historical volatility term basis for expected volatility assumption |  |  |  |  | 2 years 10 months 2 days |  |
Performance stock award | Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 99,189 | 108,414 |  |  |
Award grant date fair value (in usd per share) | $ / shares |  |  | $ 27.98 | $ 22.48 |  |  |
Vesting period (in years) |  |  | 3 years |  |  |  |
Number of publicly traded healthcare REITs in peer group | company |  |  | 16 |  |  |  |
Performance stock award | Minimum | Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 1 year |  |  |
Percentage of awards to vest relative To initial grant based on TSR performance |  |  | 0.00% |  |  |  |
Performance stock award | Maximum | Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  |  |
Percentage of awards to vest relative To initial grant based on TSR performance |  |  | 200.00% |  |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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