COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases

The following shows the gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases related primarily to the leasing of mining equipment as of December 31:

	2015		2014
	(In thousands)
Gross value	$	65,293	$	74,203
Accumulated amortization	25,878		21,598

Future minimum capital and operating lease payments

Future minimum capital and operating lease payments as of December 31, 2015, are as follows:

	Capital Leases			Operating Leases
	(In thousands)
2016	$	35,467		$	12,390
2017	27,695			7,409
2018	6,497			5,488
2019	4,336			4,421
2020	1,297			660
Thereafter	—			2,360
Total minimum lease payments	75,292			$	32,728
Less imputed interest	(4,124		)
Present value of minimum capital lease payments	$	71,168