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Summary of Significant Accounting Policies (Other Expense, Net) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Write-off of deposits and pre-acquisition costs | $ (12,390,000) | $ (13,116,000) | $ (16,992,000)
Amortization of intangible assets | (19,685,000) | (14,200,000) | (13,800,000)
Loss on debt retirements | 0 | (4,927,000) | (76,000)
Interest income | 6,837,000 | 16,739,000 | 7,593,000
Interest expense | (4,248,000) | (584,000) | (618,000)
Equity in earnings of unconsolidated entities | 1,880,000 | 747,000 | 2,690,000
Miscellaneous, net | 9,780,000 | 1,865,000 | 7,354,000
Total other expense, net | $ (17,826,000) | $ (13,476,000) | $ (13,849,000)

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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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