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Stock Based Awards and Other Equity Instruments - Summary of RSU Activity For MSUs (Parenthetical) (Details) - MSUs - shares |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1] | Nov. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share award issued |  | 389,000 |  | 284,000 |  | 213,000 |
MSU's issued under incentive plan |  | 121,000 | [2],[3] | 71,000 | [4] |  |
Employee Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, maximum |  | 125.00% |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, minimum |  | 0.00% |  |  |  |  |
Stock awards vesting term |  | MSU award provides for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index. |  |  |  |  |
Performance measurement period start date |  | Jan. 01, 2018 |  |  |  |  |
Performance measurement period end date |  | Dec. 31, 2020 |  |  |  |  |
Employee Stock | Dividend Equivalents |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
MSU's issued under incentive plan | 42,477 |  |  |  |  |  |
Employee Stock | 2011 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, maximum |  | 200.00% |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, minimum |  | 0.00% |  |  |  |  |
Stock awards vesting term |  | MSUs provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index. |  |  |  |  |
Performance measurement period start date |  | Jan. 01, 2018 |  |  |  |  |
Performance measurement period end date |  | Dec. 31, 2020 |  |  |  |  |
Employee Stock | 2018 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, maximum |  | 200.00% |  |  |  |  |
Percentage of originally granted shares that may be earned upon performance achievement, minimum |  | 0.00% |  |  |  |  |
Stock awards vesting term |  | MSUs which provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2019 through December 31, 2021 relative to the TSR performance of the Nasdaq Composite Total Return Index. |  |  |  |  |
Performance measurement period start date |  | Jan. 01, 2019 |  |  |  |  |
Performance measurement period end date |  | Dec. 31, 2021 |  |  |  |  |
MSU's issued under incentive plan |  | 78,050 |  |  |  |  |
CEO |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share award issued |  |  |  |  |  |  | 213,000
[1] | Represents 213,000 market-based RSU or MSUs awarded to the Company’s CEO in November 2017. The MSU award provides for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index. Based upon actual attainment relative to the target performance metric, the CEO has the ability to receive up to 125% of the target number of MSUs originally granted, or to be issued none at all.
[2] | Inclusive of 42,477 dividend equivalents issued to employees holding non-vested MSU grant awards in conjunction with our special cash dividend declared on November 1, 2019, which will be payable to the holder subject to, and upon vesting of, the underlying awards.
[3] | Inclusive of 78,050 MSUs which provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2019 through December 31, 2021 relative to the TSR performance of the Nasdaq Composite Total Return Index. Based upon actual attainment relative to the target performance metric, the grantee has the ability to receive up to 200% of the target number of MSUs originally granted, or to be issued none at all. These MSUs were granted under the 2018 Plan.
[4] | MSUs provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2018 through December 31, 2020 relative to the TSR performance of the Nasdaq Composite Total Return Index. Based upon actual attainment relative to the target performance metric, the grantee has the ability to receive up to 200% of the target number of MSUs originally granted, or to be issued none at all. These MSUs were granted under the 2011 Plan.

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- Definition Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. 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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