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Debt and Debt - Affiliate (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Long-Term Debt
As of December 31, 2015 and 2014, Debt and debt—affiliate consisted of the following (in thousands):
 
December 31,
2015
 
December 31,
2014
NRP LP Debt:
 
 
 
$425 million 9.125% senior notes, with semi-annual interest payments in April and October, due October 2018, $300 million issued at 99.007% and $125 million issued at 99.5%
$
422,923

 
$
422,167

Opco Debt:
 
 
 
$300 million floating rate revolving credit facility, due October 2017
290,000

 
—

$300 million floating rate revolving credit facility, due August 2016
—

 
200,000

$200 million floating rate term loan, due January 2016
—

 
75,000

4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, due June 2018
13,850

 
18,467

8.38% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2019
85,714

 
107,143

5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, due July 2020
38,462

 
46,154

5.31% utility local improvement obligation, with annual principal and interest payments in February, due March 2021
1,153

 
1,345

5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023
21,600

 
24,300

4.73% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023
60,000

 
67,500

5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024
135,000

 
150,000

8.92% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024
40,909

 
45,455

5.03% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026
148,077

 
161,538

5.18% senior notes, with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026
42,308

 
46,154

NRP Oil and Gas Debt:
 
 
 
Reserve-based revolving credit facility due November 2019
85,000

 
110,000

Total debt and debt—affiliate
1,384,996

 
1,475,223

Less: current portion of long-term debt, net
(80,983
)
 
(80,983
)
Total long-term debt and debt—affiliate
$
1,304,013

 
$
1,394,240
Principal Payments Due
The consolidated principal payments due are set forth below (in thousands):
 
NRP LP
 
 
 
Opco
NRP
Oil and Gas
 
 
 
Senior Notes
 
 
 
Senior Notes
 
Credit Facility
 
Credit Facility
 
Total
2016
$
—

 
  
 
$
80,983

 
$
—

 
$
—

 
$
80,983

2017
—

 
  
 
80,983

 
290,000

 
—

 
370,983

2018
425,000

 
(1
)
 
80,983

 
—

 
—

 
505,983

2019
—

 
  
 
76,366

 
—

 
85,000

 
161,366

2020
—

 
 
 
54,938

 
—

 
—

 
54,938

Thereafter
—

 
  
 
212,820

 
—

 
—

 
212,820

 
$
425,000





$
587,073


$
290,000


$
85,000


$
1,387,073

 
(1)
The 9.125% senior notes due 2018 were issued at a discount and as of December 31, 2015 were carried at $422.9 million.