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Stock Compensation Plans - Schedule of Nonvested Share Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Nonvested options Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 607,412 | 552,377
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price | $ 51.370 | $ 54.610
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value | $ 8.981 | $ 9.509
Granted |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 196,350 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price | $ 41.740 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value | $ 7.296 |
Vested this period Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 134,140 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price | $ 50.441 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value | $ 8.662 |
Nonvested options forfeited Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 7,175 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price | $ 54.655 |
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value | $ 9.501 |

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- Definition Represents the per-share monetary value of Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value, during the indicated time period. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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