Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue Recognition [Abstract]

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

The following table presents a reconciliation of our contract liabilities:

	December 31, 2020		December 31, 2019
	(Thousands)
Balance at beginning of period	$	226,164	$	236,730
Recognized in revenue	(10,568)		(10,566)
Balance at end of period	$	215,596	$	226,164

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table presents the amount of the contract liabilities balance expected to be recognized as revenue when performance obligations are satisfied and the transaction price allocated to the remaining performance obligations under certain contracts as of December 31, 2020.

	Contract Liabilities		Remaining Performance Obligations
	(Thousands)
2021	$	10,566	$	2,349,047
2022	10,566		2,196,621
2023	10,566		2,040,685
2024	10,568		1,487,964
2025	10,566		1,453,924
Thereafter	162,764		12,231,530
Total	$	215,596	$	21,759,771