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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | $ 521,424 |  | $ 521,424 |  | $ 523,048
Accumulated Amortization | 107,886 |  | 107,886 |  | 84,483
Amortization expense for intangible assets | 8,115 | $ 8,272 | 24,514 | $ 22,542 |
Estimated amortization expense for next 5 years |  |  |  |  |
2021 | 32,900 |  | 32,900 |  |
2022 | 32,400 |  | 32,400 |  |
2023 | 32,300 |  | 32,300 |  |
2024 | 31,800 |  | 31,800 |  |
2025 | 31,600 |  | 31,600 |  |
Customer related |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 108,226 |  | 108,226 |  | 109,378
Accumulated Amortization | 53,757 |  | 53,757 |  | 48,057
Permits and rights |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 308,998 |  | 308,998 |  | 308,705
Accumulated Amortization | 30,856 |  | 30,856 |  | 18,955
Patents |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 185 |  | 185 |  | 192
Accumulated Amortization | 140 |  | 140 |  | 139
Technology related |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 39,604 |  | 39,604 |  | 40,274
Accumulated Amortization | 12,363 |  | 12,363 |  | 9,654
Trade Names [Member] |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 31,876 |  | 31,876 |  | 31,949
Accumulated Amortization | 6,797 |  | 6,797 |  | 4,834
Air Rights [Member] |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 26,139 |  | 26,139 |  | 26,139
Accumulated Amortization | 1,561 |  | 1,561 |  | 1,044
Other |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 3,896 |  | 3,896 |  | 3,911
Accumulated Amortization | 1,475 |  | 1,475 |  | 1,331
Non-compete agreement |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 2,500 |  | 2,500 |  | 2,500
Accumulated Amortization | $ 937 |  | $ 937 |  | $ 469

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