INVENTORY AND LONG-TERM PARTS INVENTORY

The following summarizes our inventory, recorded at the lower of weighted average cost or estimated net realizable value as of December 31, 2018, and 2017, respectively (in thousands):



	December 31,
	2018		2017
Finished goods product inventory	$	48,370	$	54,577
In-process mineral inventory	24,325		19,822
Total product inventory	72,695		74,399
Current parts inventory, net	9,351		8,727
Total current inventory, net	82,046		83,126
Long-term parts inventory, net	30,031		30,611
Total inventory, net	$	112,077	$	113,737

Parts inventories are shown net of any required allowances. During the years ended December 31, 2018, 2017, and 2016, we recorded charges of approximately $1.7 million, $6.4 million, and $20.4 million, respectively, as a result of routine assessments of the lower of weighted average cost or estimated NRV on our finished goods product inventory.

During the conversion of the East plant to a Trio^®-only facility in 2016, we suspended potash production at our East facility for a total of seven days. As a result, approximately $1.7 million of production costs at our East facility that would have been allocated to additional tons produced, were excluded from our inventory values and instead expensed as period production costs in the year ended December 31, 2016.