The following table provides the components of the Company's interest and other income for the three months ended March 31, 2013 and 2012:



	Three Months Ended March 31,
	2013			2012
	(in thousands)
Alaskan Petroleum Production Tax credits and refunds (a)	$	19,408		$	11,846
Equity interest in income of unconsolidated affiliate	3,536			441
Other income	1,876			1,641
Deferred compensation plan income	1,627			1,374
Interest income	93			57
Income (loss) from vertical integration services (b)	(7,225		)	6,549
Total interest and other income	$	19,315		$	21,908

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(a)	The Company earns Alaskan Petroleum Production Tax ("PPT") credits on qualifying capital expenditures. The Company recognizes income from PPT credits when they are realized through cash refunds or as reductions in production and ad valorem taxes if realizable as offsets to PPT expense.

(b)

Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three months ended March 31, 2013 and 2012, these net margins include $56.1 million and $75.4 million of gross vertical integration revenues, respectively, and $63.3 million and $68.9 million of total vertical integration costs and expenses, respectively.