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v3.20.1

Concentration of Business (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) tannery | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2020 USD ($) tannery | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 374,910 | $ 938,735 | $ 542,205 | $ 276,839 | $ 394,130 | $ 873,800 | $ 501,913 | $ 250,594 | $ 2,132,689 | $ 2,020,437 | $ 1,903,339
Number of tanneries | tannery | 2 |  |  |  |  |  |  |  | 2 |  |
Long-lived assets | $ 209,037 |  |  |  | 213,796 |  |  |  | $ 209,037 | 213,796 |
Sales Revenue, Net | International net sales |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 730,997 | $ 742,079 | $ 729,278
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 34.30% | 36.70% | 38.30%
Sales Revenue, Net | Net sales in foreign currencies |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 587,233 | $ 605,725 | $ 617,867
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 27.50% | 30.00% | 32.50%
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 23.70% | 27.70% | 28.20%
US |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 194,679 |  |  |  | 196,702 |  |  |  | $ 194,679 | $ 196,702 |
Foreign |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 14,358 |  |  |  | $ 17,094 |  |  |  | $ 14,358 | $ 17,094 |

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