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Equity Awards - Restricted Stock Units Narrative (Details) - Restricted Stock Units [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares issued related to director fee deferrals |  |  |  | 3,222 |
Number of Unvested Restricted Stock Units Granted |  |  |  | 485,282 |
Unrecognized unvested restricted shares-based compensation expense | $ 10.3 |  |  | $ 10.3 |
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense |  |  |  | 2 years 1 month 6 days |
Plan 1 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 189,349 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 3 years |
Plan 2 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 87,034 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 0.85% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  | 25.20% |
Plan 4 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 31,816 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 3 years |
Plan 5 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 2,558 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 1 year |
Plan 7 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 30,590 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 1 year |
Plan 8 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 113,146 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  | 0.56% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  | 26.20% |
3 year EPS CAGR metric [Member] | Maximum [Member] | Plan 8 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  |  | 50.00% |
Total shareholder return metric [Member] | Plan 3 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Stock Units Granted |  |  |  | 27,567 |
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  | 127.40% |  |  |
Total shareholder return metric [Member] | Minimum [Member] | Plan 3 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 0.00% |
Total shareholder return metric [Member] | Minimum [Member] | Plan 8 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 0.00% |
Total shareholder return metric [Member] | Maximum [Member] | Plan 3 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 200.00% |
Total shareholder return metric [Member] | Maximum [Member] | Plan 8 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  |  | 50.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 200.00% |
Average stock price [Member] | Minimum [Member] | Plan 2 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 0.00% |
Average stock price [Member] | Maximum [Member] | Plan 2 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award |  |  |  | 160.00% |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares-based compensation expense | $ 0.9 |  | $ 1.0 | $ 5.6 | $ 3.9

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 number of grants made 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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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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