COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2016

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:

	2016		2015
	(In thousands)
Gross value	$	74,335	$	65,293
Accumulated amortization	32,335		25,878

Future minimum capital and operating lease payments

Future minimum capital and operating lease payments as of December 31, 2016, are as follows:

	Capital Leases			Operating Leases
	(In thousands)
2017	$	35,345		$	9,574
2018	10,467			7,784
2019	6,666			5,763
2020	3,237			1,350
2021	1,772			1,312
Thereafter	1,644			5,100
Total minimum lease payments	59,131			$	30,883
Less imputed interest	(4,070		)
Present value of minimum capital lease payments	$	55,061