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Commitments and Contingencies - Summary of accrued short- and long-term insurance liabilities (Details) - Insurance Claims [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accrued short- and long-term insurance liabilities |  |  |
Balance at beginning of period | $ 54,039 | $ 45,363 | $ 42,584
Net increases in reserves | 45,419 | 31,193 | 22,938
Net payments made | (32,654) | (22,517) | (20,159)
Balance at end of period | $ 66,804 | $ 54,039 | $ 45,363

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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