Non-GAAP Financial Measures

We use operating cash flow (“OCF”), a non-GAAP financial measure, as a key element in determining performance for purposes of incentive compensation under our annual STIP. OCF is defined as earnings before interest, taxes, depreciation, amortization, accretion and impairment (“EBITDA”) less purchases of property and equipment (EBITDA is defined as operating income plus depreciation, amortization, accretion and impairment, each determined in accordance with GAAP). Purchases of property and equipment are also determined in accordance with GAAP.

Below is a reconciliation of our non-GAAP measure for the periods stated:



	For the Year Ended December 31,
	2014			2013			2012
	(Dollars in thousands)
Operating income	$	28,151		$	45,494		$	45,728
Plus: Depreciation, amortization, accretion and impairment	16,677			15,167			21,614
EBITDA (as defined by the Company)	44,828			60,661			67,342
Less: Purchases of property and equipment	(7,679		)	(10,408		)	(9,989		)
OCF (as defined by the Company)	$	37,149		$	50,253		$	57,353