Debt And Other Long-Term Liabilities (Tables)

9 Months Ended

Sep. 30, 2013

Long-term Debt, Unclassified [Abstract]

Schedule of Debt and Other Long Term Liabilities [Table Text Block]

As of September 30, 2013	Debt and Other Liabilities
Dollars in thousands	Current		Long-term		Total
Senior unsecured notes	$	—	$	350,000	$	350,000
Callable convertible debt	51,625		—		51,625
Revolving line of credit under credit facility	—		100,000		100,000
Term loan under credit facility	18,594		130,156		148,750
Asset retirement obligation	—		12,689		12,689
Other liabilities	5		12,848		12,853
Total	$	70,224	$	605,693	$	675,917
As of December 31, 2012	Debt and Other Liabilities
Dollars in thousands	Current		Long-term		Total
Convertible debt	$	—	$	172,810	$	172,810
Term loan under credit facility	15,312		144,375		159,687
Asset retirement obligation	—		14,020		14,020
Other liabilities	217		9,974		10,191
Total	$	15,529	$	341,179	$	356,708

Schedule of Maturities of Long-term Debt [Table Text Block]

The term loan is subject to mandatory debt repayments of the outstanding borrowings. The schedule of future principal repayments is as follows:

Dollars in thousands	Repayment Amount
Remaining due in 2013	$	4,376
2014	19,687
2015	21,875
2016	102,812
Total	$	148,750

Schedule Of Additional Detail Of Convertible Notes [Table Text Block]

Additional details of our Convertible Notes are as follows:

Dollars in thousands	Principal			Discount			Net
Outstanding December 31, 2012	$	184,983		$	(12,173	)	$	172,810
Early extinguishments and debt conversion	(131,278		)	6,770			(124,508		)
Amortization of discount	—			3,323			3,323
Outstanding September 30, 2013	$	53,705		$	(2,080	)	$	51,625

Schedule of Interest Expense Related to Convertible Debt [Table Text Block]

The following interest expense was related to our Convertible Notes:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Dollars in thousands	2013		2012		2013		2012
Contractual interest expense	$	537	$	2,000	$	3,353	$	6,000
Amortization of debt discount	549		1,789		3,323		5,270
Total interest expense related to the Convertible Notes	$	1,086	$	3,789	$	6,676	$	11,270

Schedule Of Remaining Unamortized Debt Discount Expected To Be Recognized As Non Cash Interest Expense [Table Text Block]

The remaining unamortized debt discount is expected to be recognized as non-cash interest expense as follows (in thousands):

	Non-cash
Year	Interest Expense
Remainder of 2013	$	556
2014	1,524
Total unamortized discount	$	2,080