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Incentive Compensation Plan Incentive Compensation Plan - Restricted Stock Awards Estimated to be Granted on a Performance Award (Details) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Feb. 20, 2020 | Feb. 21, 2019 | Nov. 26, 2018 | May 29, 2018 | Mar. 26, 2018 | Feb. 28, 2018 | Feb. 26, 2018 | Feb. 23, 2017 | Dec. 19, 2016 | Sep. 30, 2016 | Sep. 19, 2016 | Jun. 07, 2016 | Mar. 01, 2016 | Mar. 01, 2016 | Feb. 18, 2016 | Dec. 30, 2015 | Jun. 26, 2015 | Feb. 05, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn | 40.00% | 40.00% |  |  |  | 40.00% |  | 40.00% |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Performance Shares Awards As Percentage Of Target | 100.00% | 100.00% |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Percentage Of Target Award Opportunities Maximum In Certain Cases | 200.00% | 200.00% |  |  |  | 200.00% |  | 200.00% |  |  |  |  |  |  | 200.00% |  |  |  |  |  |
Vesting period of restricted stock | 0 years | 0 years |  |  |  | 0 years |  | 0 years |  |  |  |  |  |  | 0 years | 0 years |  |  |  |  |
Performance Based Stock Awards Vesting Period | 3 years | 3 years |  |  |  | 3 years |  | 3 years |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.72 | $ 14.22 | $ 14.50
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock |  | 1 year | 1 year | 1 year | 1 year |  | 1 year |  | 3 years | 1 year | 3 years | 1 year | 1 year | 1 year |  |  | 1 year |  |  |  |
Common stock issued to executive |  | 15,000 | 2,000 | 3,000 | 2,000 |  | 77,500 |  | 15,000 | 10,000 | 33,000 | 10,000 | 5,000 | 10,000 |  |  | 1,000 |  |  |  |
Grant Price (in dollars per share) |  | $ 14.22 | $ 13.82 | $ 15.44 | $ 14.08 |  | $ 14.49 |  | $ 13.96 | $ 10.09 | $ 10.02 | $ 9.34 | $ 8.84 | $ 8.84 |  | $ 9.18 | $ 9.84 |  |  |  |
Vesting Date |  | Feb. 22, 2022 | Nov. 26, 2021 | May 29, 2021 | Mar. 26, 2021 |  | Feb. 26, 2021 |  | Dec. 19, 2019 | Sep. 30, 2019 | Sep. 19, 2019 | Jun. 07, 2019 | Mar. 01, 2019 | Mar. 01, 2019 |  |  | Jun. 26, 2018 |  |  |  |
Restricted Stock [Member] | Long Term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Common stock issued to executive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.55 |  |  |
Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 05, 2018 |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued to executive | 188,700,000 | 121,900,000 |  |  |  | 102,000,000 |  | 93,500,000 |  |  |  |  |  |  | 160,650,000 | 60,000,000 |  |  |  |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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