Property, Plant and Equipment

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment

6. Property, Plant and Equipment

	Useful lives		December 31,
	in years		2012		2011
			(In Thousands)
Machinery, equipment and automotive		3 – 30	$	253,317	$	239,322
Proved natural gas properties		*		49,801		—
Buildings and improvements		8 – 30		44,248		39,381
Furniture, fixtures and store equipment		3 – 10		6,718		5,926
Assets under capital leases		10		1,468		2,105
Land improvements		10		1,148		1,080
Construction in progress		N/A		52,673		23,714
Capital spare parts		N/A		5,430		7,407
Land		N/A		10,386		7,242
				425,189		326,177
Less accumulated depreciation, depletion and amortization				143,318		161,630
			$	281,871	$	164,547

Machinery, equipment and automotive primarily includes the categories of property and equipment and estimated useful lives as follows: chemical processing plants and plant infrastructure (15-30 years); production, fabrication, and assembly equipment (7-15 years); certain processing plant components (3-10 years); and trucks, automobiles, trailers, and other rolling stock (3-7 years). At December 31, 2012 and 2011, assets capitalized under capital leases consist of machinery and equipment. Accumulated amortization for assets capitalized under capital leases were $567,000 and $718,000 at December 31, 2012 and 2011, respectively. During 2012, interest cost capitalized in PP&E was $398,000 (none during 2011).

* See information concerning natural gas properties included in PP&E in Note 1- Summary of Significant Accounting Policies and Note 2 – Acquisition of Working Interests in Natural Gas Properties.