Property, Plant and Equipment

3 Months Ended

Mar. 31, 2012

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

3. Property, Plant and Equipment

The components of property, plant and equipment are as follows:

(in thousands)	March 31, 2012		December 31, 2011		March 31, 2011
Land	$	17,171	$	17,655	$	15,424
Land improvements and leasehold improvements		48,587		47,958		45,359
Buildings and storage facilities		153,666		150,461		142,017
Machinery and equipment		196,434		191,833		183,568
Software		10,949		10,861		10,549
Construction in progress		20,888		13,006		2,734
		447,695		431,774		399,651
Less accumulated depreciation and amortization		260,111		256,687		249,389
	$	187,584	$	175,087	$	150,262

Depreciation expense on property, plant and equipment amounted to $5.5 million, $20.4 million and $4.9 million for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively.

Railcars

The components of Railcar assets leased to others are as follows:

(in thousands)	March 31, 2012		December 31, 2011		March 31, 2011
Railcar assets leased to others	$	293,081	$	272,883	$	236,285
Less accumulated depreciation		78,058		75,746		67,096
	$	215,023	$	197,137	$	169,189

Depreciation expense on railcar assets leased to others amounted to $3.9 million, $13.8 million and $3.3 million for the periods ended March 31, 2012, December 31, 2011 and March 31, 2011, respectively.