Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The timing of revenue recognition, billings, and cash collections resulted in the following contract assets and contract liabilities:

(Thousands)	December 31, 2019		December 31, 2018		$ change			% change
Accounts receivable, trade	$	141,168	$	124,498	$	16,670		13	%
Unbilled receivables	13,583		4,619		8,964			194	%
Unearned revenue	3,380		5,918		(2,538		)	(43	)%