8. INTANGIBLE ASSETS AND LIABILITIES

Our intangible assets resulted from our acquisition, as part of a business combination, of contracts with terms that are favorable to prevailing market prices at the time of acquisition. Amortization of intangible assets recognized in expense was $2.2 million in 2016, $2.1 million in 2015 and $1.2 million in 2014.

Our intangible liabilities resulted from our acquisition, as part of a business combination, of contracts with terms that are unfavorable to prevailing market prices at the time of acquisition. Amortization of intangible liabilities recognized in Revenues was $1.0 million in 2016, 2015, and 2014.

The intangible assets and liabilities are generally amortized straight-line over the life of the related contract. The estimated amortization amounts from intangibles assets and liabilities for each of the next five years as of December 31, 2016 are as follows:



	Amount of Amortization to Recognize in Revenues		Amount of Amortization to Recognize in Expense
	(In thousands)
2017	$	1,068	$	2,017
2018	1,068		2,017
2019	266		2,017
2020	—		2,017
2021	—		2,018