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 September 30, 2017, and December 31, 2016 (in thousands):



	September 30, 2017		December 31, 2016
Finished goods product inventory	$	47,088	$	52,571
In-process mineral inventory	24,700		22,126
Total product inventory	71,788		74,697
Current parts inventory, net	12,014		19,658
Total current inventory, net	83,802		94,355
Long-term parts inventory, net	28,890		21,037
Total inventory, net	$	112,692	$	115,392

Parts inventories are shown net of any required allowances. At September 30, 2017, and December 31, 2016, allowances for parts inventory obsolescence were $3.1 million.

During the nine months ended September 30, 2017, and 2016, we recorded charges of approximately $4.8 million and $17.1 million, respectively, as a result of routine assessments of the lower of weighted average cost or estimated net realizable value of our finished goods product inventory.

During the conversion of the East facility to Trio^®-only in 2016, we suspended East production for 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 during the nine-month period ended September 30, 2016.