PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2015

PROPERTY, PLANT AND EQUIPMENT

Schedule of property, plant and equipment

	2015		2014
	(in thousands)
Mining equipment and processing facilities	$	1,923,310	$	1,757,772
Land and mineral rights	418,668		376,937
Buildings, office equipment and improvements	291,106		278,283
Construction and mine development in progress	94,482		82,530
Mine development costs	316,694		320,098
Property, plant and equipment, at cost	3,044,260		2,815,620
Less accumulated depreciation, depletion and amortization	(1,243,985)		(1,150,414)
Total property, plant and equipment, net	$	1,800,275	$	1,665,206