Debt and Other Long-Term Liabilities (Tables)

9 Months Ended

Sep. 30, 2014

Long-term Debt, Unclassified [Abstract]

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

	Debt														Other Liabilities							Total
	Senior Notes						Credit Facility					Total Debt			Capital Lease Obligations			Asset retirement obligations		Other long-term liabilities
Dollars in thousands	Senior Unsecured Notes due 2019			Senior Unsecured Notes due 2021			Term Loans			Revolving Line of Credit
As of September 30, 2014:
Principal	$	350,000		$	300,000		$	148,125		$	210,000	$	1,008,125
Discount	(4,551		)	(4,313		)	(354		)	—		(9,218		)
Total	345,449			295,687			147,771			$	210,000	998,907			$	18,051		$	13,466	$	12,974	$	1,043,398
Less: current portion	—			—			(8,445		)	—		(8,445		)	(12,150		)	—		—		(20,595		)
Total long-term portion	$	345,449		$	295,687		$	139,326		$	210,000	$	990,462		$	5,901		$	13,466	$	12,974	$	1,022,803
Unamortized deferred financing fees(1)	$	688		$	1,425		$	—		$	3,132	$	5,245									$	5,245

⁽¹⁾Deferred financing fees are recorded in other long-term assets in our Consolidated Balance Sheets and are amortized on a straight line basis over the life of the related loan.

	Debt														Other Liabilities								Total
	Senior Unsecured Notes due 2019			Credit Facility					Convertible Notes			Total Debt			Capital Lease Obligations			Asset retirement obligations		Other long-term liabilities
Dollars in thousands				Term Loans			Revolving Line of Credit
As of December 31, 2013:
Principal	$	350,000		$	344,375		$	—	$	51,148		$	745,523
Discount	(5,317		)	—			—		(1,446		)	(6,763		)
Total	344,683			344,375			$	—	49,702			738,760			$	21,361		$	13,086	$	12,085		$	785,292
Less: current portion	—			(42,187		)	—		(49,702		)	(91,889		)	(11,997		)	—		(3		)	(103,889		)
Total long-term portion	$	344,683		$	302,188		$	—	$	—		$	646,871		$	9,364		$	13,086	$	12,082		$	681,403
Unamortized deferred financing fees(1)	$	832		$	1,259		$	2,749	$	186		$	5,026										$	5,026

⁽¹⁾Deferred financing fees are recorded in other long-term assets in our Consolidated Balance Sheets and are amortized on a straight line basis over the life of the related loan.

Interest Income and Interest Expense Disclosure [Table Text Block]

Interest Expense

Dollars in thousands	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2014		2013			2014		2013
Cash interest expense	$	11,517	$	7,304		$	29,646	$	17,716
Non-cash interest expense:
Amortization of debt discount	616		804			2,171		3,876
Amortization of deferred financing fees	285		366			1,252		1,341
Other	—		(54		)	—		(548		)
Total non-cash interest expense	901		1,116			3,423		4,669
Total cash and non-cash interest expense	12,418		8,420			33,069		22,385
Loss from early extinguishment of debt	55		1			2,018		5,950
Total interest expense	$	12,473	$	8,421		$	35,087	$	28,335

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

The Amended and Restated Credit Agreement requires principal amortization payments under the Term Loan as follows:

Dollars in thousands	Repayment Amount
Remainder of 2014	$	1,875
2015	9,376
2016	13,126
2017	15,000
2018	18,750
2019	89,998
Total	$	148,125