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Stock-Based Compensation, Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-Based Compensation Expense [Abstract] |  |  |
Stock-based compensation expense (income) | $ 24,060 | $ 9,909 | $ 26,609
Stock Options [Member] |  |  |
Unrecognized Stock-Based Compensation Expense [Abstract] |  |  |
Unrecognized stock-based compensation expense | $ 8,600 |  |
Unrecognized stock-based compensation expense, period for recognition | 1 year 6 months |  |
Restricted Stock Awards [Member] |  |  |
Unrecognized Stock-Based Compensation Expense [Abstract] |  |  |
Unrecognized stock-based compensation expense | $ 28,000 |  |
Unrecognized stock-based compensation expense, period for recognition | 2 years 7 months 6 days |  |
Service-Based Options [Member] |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Stock-based compensation expense (income) | $ 300 | 2,600 | 3,100
Service-Based Restricted Stock Units [Member] |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Stock-based compensation expense (income) | 13,900 | 11,500 | 11,200
Performance-Based Options [Member] |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Stock-based compensation expense (income) | 9,900 | (4,100) | 12,200
Performance Stock Units [Member] |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |
Stock-based compensation expense (income) | $ 0 | $ 100 | $ (100)

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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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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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