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Supplemental Balance Sheet, Income Statement and Cash Flow Information - Acquisitions of Businesses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental cash flow information |  |  |
Cash paid for income taxes |  | $ 6,553 | $ 11,383
Cash paid for interest, net of capitalized interest | $ 157,437 | 174,357 | 202,803
Cash received from income tax refund | 17,505 |  |
Net change in accounts payable related to capital expenditures | $ (1,188) | (7,624) | (8,556)
Non-cash increase in assets attributable to redeemable noncontrolling interest in subsidiary |  |  | 43,928
Acquisitions of businesses: |  |  |
Fair value of assets acquired |  | 2,929 | 48,053
Goodwill |  |  | 11,436
Liabilities assumed |  |  | (34,489)
Cash paid for acquisitions of businesses |  | 2,929 | 25,000
Cash and restricted cash acquired in acquisitions of businesses |  |  | (4,141)
Cash (acquired in) paid for acquisitions of businesses, net |  | $ (2,929) | $ (20,859)

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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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