Cash flow information (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Interest, net	$ 64,596	$ 58,359
Income taxes paid, net	1,816	8,887
AFUDC borrowed	2,000	1,800
Right-of-use assets obtained in exchange for new operating lease liabilities	46,770
Property, plant and equipment additions in accounts payable	34,368	34,594	$ 42,355
Debt assumed in connection with a business combination	1,163
Issuance of common stock in connection with a business combination	0	17,993	$ 18,186
Continuing and discontinued operations
Income taxes paid, net	$ 2,000	$ 5,100