Debt and Other Long-Term Liabilities (Tables)

9 Months Ended

Sep. 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 September 30, 2015:
Principal	$	350,000		$	300,000		$	139,688		$	55,000	$	844,688
Discount	(3,530		)	(3,670		)	(279		)	—		(7,479		)
Total	346,470			296,330			139,409			55,000		837,209			$	8,177		$	9,497	$	19,260	$	874,143
Less: current portion	—			—			(12,188		)	—		(12,188		)	(5,680		)	—		—		(17,868		)
Total long-term portion	$	346,470		$	296,330		$	127,221		$	55,000	$	825,021		$	2,497		$	9,497	$	19,260	$	856,275
Unamortized deferred financing fees(1)	$	534		$	1,213		$	—		$	2,467	$	4,214									$	4,214

	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				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Cash interest expense	$	11,297	$	11,519	$	34,191	$	29,654
Non-cash interest expense:
Amortization of debt discount	435		616		1,304		2,171
Amortization of deferred financing fees	258		285		774		1,252
Total non-cash interest expense	693		901		2,078		3,423
Total cash and non-cash interest expense	11,990		12,420		36,269		33,077
Loss from early extinguishment of debt	—		55		—		2,018
Total interest expense	$	11,990	$	12,475	$	36,269	$	35,095

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	$	2,813
2016	13,125
2017	15,000
2018	18,750
2019	90,000
Total	$	139,688