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Debt and Other Long-Term Liabilities (Tables)
 6 Months Ended
Jun. 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
 
Convertible Notes
 
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, 2014:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Principal
$
350,000

 
$
300,000

 
$
150,000

 
$
165,000

 
$
33,424

 
$
998,424

 
 
 
 
 
 
 

Discount
(4,806
)
 
(4,473
)
 
(373
)
 
—

 
(181
)
 
(9,833
)
 
 
 
 
 
 
 

Total
345,194

 
295,527

 
149,627

 
$
165,000

 
33,243

 
988,591

 
$
19,778

 
$
13,389

 
$
12,967

 
$
1,034,725

Less: current portion
—

 
—

 
(7,500
)
 
—

 
(33,243
)
 
(40,743
)
 
(12,265
)
 
—

 
—

 
(53,008
)
Total long-term portion
$
345,194

 
$
295,527

 
$
142,127

 
$
165,000

 
$
—

 
$
947,848

 
$
7,513

 
$
13,389

 
$
12,967

 
$
981,717

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unamortized deferred financing fees(1)
$
773

 
$
1,478

 
$
—

 
$
3,301

 
$
25

 
$
5,577

 
 
 
 
 
 
 
$
5,577

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Debt
 
 
 
Other Liabilities
 
Total
 
Senior Notes
 
Credit Facility
 
Convertible Notes
 
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, 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.
Schedule of Interest Expense [Table Text Block]
Interest Expense
Dollars in thousands
Three Months Ended
 
Six Months Ended
June 30,
 
June 30,
2014
 
2013
 
2014
 
2013
Cash interest expense
$
9,770

 
$
7,506

 
$
18,129

 
$
10,412

Non-cash interest expense:
 
 
 
 
 
 
 
Amortization of debt discount
753

 
1,366

 
1,555

 
3,072

Amortization of deferred financing fees
463

 
457

 
967

 
975

Other
—

 
(81
)
 
—

 
(494
)
Total non-cash interest expense
1,216

 
1,742

 
2,522

 
3,553

Total cash and non-cash interest expense
10,986

 
9,248

 
20,651

 
13,965

Loss from early extinguishment of debt
1,963

 
4,011

 
1,963

 
5,949

Total interest expense
$
12,949

 
$
13,259

 
$
22,614

 
$
19,914
Quarterly Principal Amortization Payments [Table Text Block]
The Amended and Restated Credit Agreement requires quarterly principal amortization payments under the Term Loan as follows:
Year
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
2014
 
 
 
 
$
1,875

 
$
1,875

2015
$
1,875

 
$
1,875

 
$
2,813

 
$
2,813

2016
$
2,813

 
$
2,813

 
$
3,750

 
$
3,750

2017
$
3,750

 
$
3,750

 
$
3,750

 
$
3,750

2018
$
3,750

 
$
3,750

 
$
5,625

 
$
5,625

2019
$
5,625

 
$
84,373

(1) 
(1) Any remaining principal balance is due and payable in full on June 24, 2019