Supplemental Cash Flow Information details - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Interest Paid, Capitalized	$ 5,514	$ 8,831
Interest Paid	20,190	16,572
Income Taxes Paid, Net	53,358	8,690
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	7,743	22,270
Capital Expenditures Incurred but Not yet Paid	$ 6,143	$ 0