Supplemental Financial Statement Information (Allowance for Credit Losses for Accounts and Other Receivables ) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for credit losses
Other	$ (2,248)	$ 155	$ (1,370)
Amounts charged to expense	42,193	28,488	26,370
Accounts and other receivables	18,899	17,830	17,443
Other assets	16,445	0	0
ASU 2016-13
Allowance for credit losses
Balance at beginning of year	17,830	17,443	14,319
Amounts charged to expense	19,789	16,345	9,770
Write-offs, recoveries and currency impact	(17,611)	(15,958)	(6,646)
Balance at end of year	35,344	17,830	17,443
ASU 2016-13 | Cumulative Effect
Allowance for credit losses
Balance at beginning of year	$ 15,336	0	0
Balance at end of year		$ 15,336	$ 0