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Market Concentrations and Risks (Details) $ in Thousands, lb in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) lb Distributor Customer | Dec. 31, 2019 USD ($) Customer Distributor | Dec. 31, 2018 Customer Distributor
Concentration Risk [Line Items] |  |  |
Number of customers | Customer | 10 | 10 | 10
Number of distributors | Distributor | 6 | 6 | 6
Total senior subordinated notes | $ 1,590,810 | $ 1,459,380 |
Senior Subordinated Notes |  |  |
Concentration Risk [Line Items] |  |  |
Fair value of debt instrument | $ 1,633,700 | $ 1,532,700 |
Copper |  |  |
Concentration Risk [Line Items] |  |  |
Committed amounts to purchase (in pounds) | lb | 1.9 |  |
Committed amounts to purchase (in usd) | $ 6,000 |  |
Gain (loss) on unconditional purchase obligation | $ 700 |  |
Customer Concentration Risk | Consolidated Revenues |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 40.00% | 39.00% | 40.00%
Labor Force Concentration Risk | Workforce Subject to Collective Bargaining Arrangements |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 28.00% |  |
Labor Force Concentration Risk | Workforce Subject to Collective Bargaining Arrangements Expiring within One Year |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 25.00% |  |

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