Mineral Interests and Property, Plant and Equipment

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Mineral Interests and Property, Plant and Equipment

Mineral interests totaled $3,083.5 million and $3,146.0 million as of December 31, 2014 and 2013, respectively. The related accumulated depletion totaled $246.7 million and $241.0 million as of December 31, 2014 and 2013, respectively.

Property, plant and equipment are summarized as follows (in thousands):



	December 31,
	2014			2013
Land	$	38,624		$	79,733
Land improvements	29,739			43,107
Building and leasehold improvements	417,352			420,142
Mine development costs	262,641			255,680
Machinery and equipment	1,613,033			1,569,318
Gas properties and related development	190,233			188,527
Construction in progress	53,774			61,933
Total	2,605,396			2,618,440
Less: Accumulated depreciation	(1,139,099		)	(980,888		)
Net	$	1,466,297		$	1,637,552

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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