Debt and Other Long-Term Liabilities (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016:
Principal	$	320,614		$	228,598		$	129,375		$	80,000		$	758,587
Unamortized discount and deferred financing fees(1)	(2,922		)	(3,234		)	(224		)	(1,968		)	(8,348		)
Total	317,692			225,364			129,151			78,032			750,239			$	5,531		$	9,438	$	19,780	$	784,988
Less: current portion	—			—			(15,000		)	—			(15,000		)	(3,418		)	—		—		(18,418		)
Total long-term portion	$	317,692		$	225,364		$	114,151		$	78,032		$	735,239		$	2,113		$	9,438	$	19,780	$	766,570

	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, 2015:
Principal	$	350,000		$	258,908		$	136,875		$	140,500		$	886,283
Unamortized discount and deferred financing fees(1)	(3,770		)	(4,083		)	(260		)	(2,300		)	(10,413		)
Total	346,230			254,825			136,615			138,200			875,870			$	5,889		$	9,412	$	19,477	$	910,648
Less: current portion	—			—			(13,125		)	—			(13,125		)	(4,006		)	—		—		(17,131		)
Total long-term portion	$	346,230		$	254,825		$	123,490		$	138,200		$	862,745		$	1,883		$	9,412	$	19,477	$	893,517

(1) As described in Note 1: Basis of Presentation and Principles of Consolidation, we adopted ASU 2015-03 and 2015-15 in the first quarter of 2016 and have applied the guidance to our Senior Notes and Credit Facility. Under this guidance, we are now presenting unamortized deferred financing fees as a direct deduction from the associated debt liability. Historically, unamortized deferred financing fees were included in other non-current assets. This adoption resulted in the reclassification of $3.8 million of unamortized deferred financing fees as of December 31, 2015, from other non-current assets to long-term debt in our Consolidated Balance Sheets. Deferred financing fees 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,
	2016			2015		2016			2015
Cash interest expense	$	10,141		$	11,499	$	20,795		$	22,894
Amortization of debt discount and deferred financing fees	613			692		1,251			1,385
Total cash and non-cash interest expense	10,754			12,191		22,046			24,279
Gain from early extinguishment of debt	(418		)	—		(11,446		)	—
Total interest expense	$	10,336		$	12,191	$	10,600		$	24,279

Schedule of Maturities of Term Loan

Required principal amortization payments under the Term Loan are as follows:

Dollars in thousands	Repayment Amount
Remainder of 2016	$	7,500
2017	15,000
2018	20,625
2019	86,250
Total	$	129,375