DEFERRED CHARGES AND OTHER ASSETS, NET

12 Months Ended

Dec. 31, 2017

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, 2017		December 31, 2016
Deferred turnaround costs, net	$	560,403	$	302,919
Catalyst	131,019		114,788
Environmental credits	42,452		51,636
Linefill	19,485		19,485
Pension plan assets	9,593		9,440
Intangible assets, net	537		577
Other	16,435		5,158
Total deferred charges and other assets, net	$	779,924	$	504,003

The Company recorded amortization expense related to deferred turnaround costs, catalyst and intangible assets of $143,978, $105,547 and $102,636 for the years ended December 31, 2017, 2016 and 2015, respectively.

Intangible assets, net was comprised of permits and emission credits as follows:

	December 31, 2017			December 31, 2016
Gross amount	$	3,996		$	3,996
Accumulated amortization	(3,459		)	(3,419		)
Net amount	$	537		$	577