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Accounting for Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-Based Compensation Recognized | $ 24,570 | $ 26,031 | $ 19,581
Stock-Based Compensation Unrecognized | 22,077 |  |
Restricted Stock Units (RSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-Based Compensation Recognized | 11,895 | 10,644 | 7,410
Stock-Based Compensation Unrecognized | $ 10,777 |  |
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year) | 1 year 8 months 12 days |  |
Cash Settled RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-Based Compensation Recognized | $ 7,015 | 10,213 | 8,214
Stock-Based Compensation Unrecognized | $ 8,688 |  |
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year) | 1 year 6 months |  |
Non-Employee Director Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-Based Compensation Recognized | $ 755 | 719 | 764
Stock-Based Compensation Unrecognized | $ 383 |  |
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year) | 4 months 24 days |  |
Performance Shares |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-Based Compensation Recognized | $ 4,905 | $ 4,455 | $ 3,193
Stock-Based Compensation Unrecognized | $ 2,229 |  |
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year) | 1 year 6 months |  |

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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 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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