Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 27,168	$ 30,287
Noncash investing and financing activity
Dividends declared not yet paid	5,764	5,530
Capital projects incurred but not yet paid	4,070	15,317
Equity issued in conjunction with acquisition	0	127,841
Removal of preexisting ownership interest	0	(159,459)
Purchase price holdback/ other accrued liabilities	$ 0	$ 31,885