DEFERRED CHARGES AND OTHER ASSETS, NET

12 Months Ended

Dec. 31, 2018

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

DEFERRED CHARGES AND OTHER ASSETS, NET

DEFERRED CHARGES AND OTHER ASSETS, NET

Deferred charges and other assets, net consisted of the following:

	December 31, 2018		December 31, 2017
Deferred turnaround costs, net	$	673,107	$	560,403
Catalyst, net	124,290		131,019
Environmental credits	37,811		42,452
Linefill	19,485		19,485
Pension plan assets	9,694		9,593
Intangible assets, net	511		537
Other	6,950		16,435
Total deferred charges and other assets, net	$	871,848	$	779,924

Catalyst, net includes $73,079 and $73,967 of indefinitely-lived precious metal catalysts as of December 31, 2018 and December 31, 2017, respectively.

The Company recorded amortization expense related to deferred turnaround costs, catalyst and intangible assets of $207,191, $143,978 and $105,547 for the years ended December 31, 2018, 2017 and 2016, respectively.

Intangible assets, net primarily consists of permits and emission credits. Our net balance as of December 31, 2018 and December 31, 2017 is shown below.

	December 31, 2018			December 31, 2017
Intangible assets - gross	$	3,996		$	3,996
Accumulated amortization	(3,485		)	(3,459		)
Intangible assets - net	$	511		$	537