Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Intangible Assets, by category
Gross Carrying Amount	$ 406,105		$ 406,105		$ 170,588
Accumulated Amortization	105,005		105,005		101,381
Amortization expense for intangible assets	5,668	$ 1,943	9,508	$ 3,969
Estimated amortization expense for next 5 years
2019	15,750		15,750
2020	23,500		23,500
2021	22,250		22,250
2022	22,000		22,000
2023	22,000		22,000
Customer related
Intangible Assets, by category
Gross Carrying Amount	140,441		140,441		122,379
Accumulated Amortization	95,360		95,360		93,580
Permits
Intangible Assets, by category
Gross Carrying Amount	170,258		170,258		0
Accumulated Amortization	2,347		2,347		0
Patents
Intangible Assets, by category
Gross Carrying Amount	240		240		2,598
Accumulated Amortization	160		160		2,503
Technology related
Intangible Assets, by category
Gross Carrying Amount	33,919		33,919		35,831
Accumulated Amortization	4,411		4,411		2,681
Trade names
Intangible Assets, by category
Gross Carrying Amount	31,428		31,428		5,565
Accumulated Amortization	1,499		1,499		681
Air rights
Intangible Assets, by category
Gross Carrying Amount	26,139		26,139		0
Accumulated Amortization	140		140
Other
Intangible Assets, by category
Gross Carrying Amount	3,680		3,680		4,215
Accumulated Amortization	$ 1,088		$ 1,088		$ 1,936