Revenue (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides information about contract assets and contract liabilities from contracts with customers:

	June 30, 2020		December 31, 2019		January 1, 2019
Contract assets	$	16,423	$	14,894	$	9,330
Contract liabilities - current	78,258		44,001		36,461
Contract liabilities - non-current	12,247		9,121		9,382