Revenue Recognition (Contract Balances) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Trade accounts receivable, net
Balance, January 1, 2020	$ 15,444
Balance, December 31, 2020	18,894
Increase (decrease) in accounts receivable	3,450
Long-term asset
Balance, January 1, 2020	1,977
Balance, December 31, 2020	4,984
Increase (decrease) in long-term assets	3,007
Contract liability (current)
Balance, January 1, 2020	944
Balance, December 31, 2020	941
Increase (decrease) in contract liability (current)	(3)
Contract liability (long-term)
Balance, January 1, 2020	2,153
Balance, December 31, 2020	3,626
Increase (decrease) in contract liability (long-term)	$ 1,473