Interest Expense (Tables)

3 Months Ended

Mar. 31, 2013

Interest and Debt Expense [Abstract]

Schedule Of Interest Expense

The following table presents an analysis of interest expense:

	For the year Ended December 31,
	2010		2011		2012
	(Dollars in thousands)
Interest incurred on debt	$	985	$	5,745	$	10,172
Amortization of discount on Senior Subordinated Notes	806		10,039		10,742
Amortization of debt issuance costs	1,761		1,521		1,712
Supply Chain Financing mark-up	1,524		1,002		621
Total interest expense	$	5,076	$	18,307	$	23,247

	For the Three Months Ended
	March 31,
	2012		2013
	(Dollars in thousands)
Interest incurred on debt	$	1,637	$	5,449
Amortization of discount on Senior Subordinated Notes	2,617		2,801
Amortization of debt issuance costs	377		555
Supply Chain Financing mark-up	131		203
Total interest expense	$	4,762	$	9,008