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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 22, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 8,300,000 | $ 9,100,000 |  |
Impairment of indefinite-lived intangible asset | 6,800,000 | 0 |  |
Goodwill And Other Intangible Assets |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 213,300,000 | 213,000,000.0 |  | $ 199,900,000
Goodwill, accumulated impairment loss | (2,300,000) | (2,300,000) |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill, gross | 15,100,000 | 15,100,000 |  | $ 15,100,000
Goodwill, accumulated impairment loss | (4,500,000) | $ (4,500,000) |  |
TMR |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets |  |  | $ 11,200,000 |
Indefinite-lived intangible assets | $ 0 |  | $ 6,800,000 |
Low |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 2 years 3 months 18 days |  |  |
High |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 13 years 2 months 12 days |  |  |
Weighted Average or Actual |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 6 years 2 months 12 days |  |  |

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- Definition Schedule of Goodwill and Intangible Assets [Line Items] + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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