Debt And Other Long-Term Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Long-term Debt, Unclassified [Abstract]

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

As of June 30, 2013	Debt and Other Liabilities
Dollars in thousands	Current		Long-term		Total
Senior unsecured notes	$	—	$	350,000	$	350,000
Callable convertible debt	51,105		—		51,105
Term loan	17,500		135,625		153,125
Asset retirement obligation	—		12,444		12,444
Other liabilities	15		12,796		12,811
Total	$	68,620	$	510,865	$	579,485
As of December 31, 2012	Debt and Other Liabilities
Dollars in thousands	Current		Long-term		Total
Convertible debt	$	—	$	172,810	$	172,810
Term loan	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	$	8,751
2014	19,687
2015	21,875
2016	102,812
Total	$	153,125

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	(131,248		)	6,769			(124,479		)
Amortization of discount	—			2,774			2,774
Outstanding June 30, 2013	$	53,735		$	(2,630	)	$	51,105

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

The following interest expense was related to our Convertible Notes:

	Three Months Ended June 30,				Six Months Ended June 30,
Dollars in thousands	2013		2012		2013		2012
Contractual interest expense	$	1,115	$	2,000	$	2,816	$	4,000
Amortization of debt discount	1,111		1,764		2,774		3,481
Total interest expense related to the Convertible Notes	$	2,226	$	3,764	$	5,590	$	7,481

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	$	1,090
2014	1,540
Total unamortized discount	$	2,630