Debt and Other Long-Term Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Long-term Debt, Unclassified [Abstract]

Schedule of Debt and Other Long Term Liabilities

	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 June 30, 2015:
Principal	$	350,000		$	300,000		$	142,500		$	90,000	$	882,500
Discount	(3,786		)	(3,830		)	(298		)	—		(7,914		)
Total	346,214			296,170			$	142,202		90,000		874,586			$	9,876		$	9,577	$	16,526	$	910,565
Less: current portion	—			—			(11,250		)	—		(11,250		)	(7,240		)	—		—		(18,490		)
Total long-term portion	$	346,214		$	296,170		$	130,952		$	90,000	$	863,336		$	2,636		$	9,577	$	16,526	$	892,075
Unamortized deferred financing fees(1)	$	572		$	1,266		$	—		$	2,632	$	4,470									$	4,470

	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 December 31, 2014:
Principal	$	350,000		$	300,000		$	146,250		$	160,000	$	956,250
Discount	(4,296		)	(4,152		)	(335		)	—		(8,783		)
Total	345,704			295,848			$	145,915		160,000		947,467			$	15,391		$	13,576	$	17,651	$	994,085
Less: current portion	—			—			(9,390		)	—		(9,390		)	(11,026		)	—		—		(20,416		)
Total long-term portion	$	345,704		$	295,848		$	136,525		$	160,000	$	938,077		$	4,365		$	13,576	$	17,651	$	973,669
Unamortized deferred financing fees(1)	$	649		$	1,372		$	—		$	2,965	$	4,986									$	4,986

(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 Expense Disclosure

Interest Expense

Dollars in thousands	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2015		2014		2015		2014
Cash interest expense	$	11,499	$	9,773	$	22,894	$	18,135
Non-cash interest expense:
Amortization of debt discount	434		753		869		1,555
Amortization of deferred financing fees	258		463		516		967
Total non-cash interest expense	692		1,216		1,385		2,522
Total cash and non-cash interest expense	12,191		10,989		24,279		20,657
Loss from early extinguishment of debt	—		1,963		—		1,963
Total interest expense	$	12,191	$	12,952	$	24,279	$	22,620

Schedule of Maturities of Long-term Debt

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

Dollars in thousands	Repayment Amount
Remainder of 2015	$	5,625
2016	13,125
2017	15,000
2018	18,750
2019	90,000
Total	$	142,500