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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | $ 574,570 |  | $ 574,570 |  | $ 412,657
Accumulated Amortization | 125,125 |  | 125,125 |  | 113,575
Amortization expense for intangible assets | 8,352 | $ 1,901 | 14,270 | $ 3,840 |
Estimated amortization expense for next 5 years |  |  |  |  |
2020 | 31,200 |  | 31,200 |  |
2021 | 32,300 |  | 32,300 |  |
2022 | 31,600 |  | 31,600 |  |
2023 | 31,600 |  | 31,600 |  |
2024 | 31,100 |  | 31,100 |  |
Customer related |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 165,770 |  | 165,770 |  | 143,996
Accumulated Amortization | 101,512 |  | 101,512 |  | 99,327
Permits |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 308,432 |  | 308,432 |  | 170,322
Accumulated Amortization | 11,028 |  | 11,028 |  | 4,694
Patents |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 185 |  | 185 |  | 249
Accumulated Amortization | 130 |  | 130 |  | 168
Technology related |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 36,411 |  | 36,411 |  | 36,467
Accumulated Amortization | 6,966 |  | 6,966 |  | 5,635
Trade names |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 31,525 |  | 31,525 |  | 31,719
Accumulated Amortization | 3,452 |  | 3,452 |  | 2,182
Air rights |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 26,139 |  | 26,139 |  | 26,139
Accumulated Amortization | 743 |  | 743 |  | 411
Other |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 3,608 |  | 3,608 |  | 3,765
Accumulated Amortization | 1,138 |  | 1,138 |  | 1,158
Noncompete Agreements |  |  |  |  |
Intangible Assets, by category |  |  |  |  |
Gross Carrying Amount | 2,500 |  | 2,500 |  | $ 0
Accumulated Amortization | $ 156 |  | $ 156 |  |

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