Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 38,978	$ 47,164
Noncash investing and financing activity
Dividends declared not yet paid	5,770	5,547
Capital projects incurred but not yet paid	5,534	8,245
Equity issued in conjunction with acquisition	0	127,841
Removal of preexisting ownership interest	0	(159,459)
Purchase price holdback/ other accrued liabilities	$ 0	$ 29,956