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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consists of the following (in thousands): 
 
December 31,
 
2019
 
2018
 
 
 
 
Term Loan (previously scheduled to mature June 2020)
$
—

 
$
33,693

Term Loan (matures December 2021)
33,250

 
—

2022 Notes (mature May 2022)
125,000

 
125,000

2023 Notes (mature September 2023)
125,000

 
125,000

MARAD Debt (matures February 2027)
63,610

 
70,468

Nordea Q5000 Loan (matures April 2020)
89,286

 
125,000

Unamortized debt discounts
(22,540
)
 
(28,802
)
Unamortized debt issuance costs
(7,753
)
 
(10,044
)
Total debt
405,853

 
440,315

Less current maturities
(99,731
)
 
(47,252
)
Long-term debt
$
306,122

 
$
393,063
Schedule of maturities of long-term debt outstanding
Scheduled maturities of our long-term debt outstanding as of December 31, 2019 are as follows (in thousands): 
 
Term
Loan (1)
 
2022
Notes
 
2023
Notes
 
MARAD
Debt
 
Nordea
Q5000
Loan
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
Less than one year
$
3,500

 
$
—

 
$
—

 
$
7,200

 
$
89,286

 
$
99,986

One to two years
29,750

 
—

 
—

 
7,560

 
—

 
37,310

Two to three years
—

 
125,000

 
—

 
7,937

 
—

 
132,937

Three to four years
—

 
—

 
125,000

 
8,333

 
—

 
133,333

Four to five years
—

 
—

 
—

 
8,749

 
—

 
8,749

Over five years
—

 
—

 
—

 
23,831

 
—

 
23,831

Gross debt
33,250

 
125,000

 
125,000

 
63,610

 
89,286

 
436,146

Unamortized debt discounts (2)
—

 
(7,999
)
 
(14,541
)
 
—

 
—

 
(22,540
)
Unamortized debt issuance costs (3)
(381
)
 
(1,236
)
 
(2,344
)
 
(3,537
)
 
(255
)
 
(7,753
)
Total debt
32,869

 
115,765

 
108,115

 
60,073

 
89,031

 
405,853

Less current maturities
(3,500
)
 
—

 
—

 
(7,200
)
 
(89,031
)
 
(99,731
)
Long-term debt
$
29,369

 
$
115,765

 
$
108,115

 
$
52,873

 
$
—

 
$
306,122

(1)
Term Loan pursuant to the Credit Agreement matures in December 2021.
(2)
The 2022 Notes and the 2023 Notes will increase to their face amounts through accretion of their debt discounts to interest expense through May 2022 and September 2023, respectively.
(3)
Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement.
Schedule of components of net interest expense
The following table details the components of our net interest expense (in thousands): 
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
 
 
 
 
 
Interest expense
$
31,186

 
$
32,617

 
$
38,274

Capitalized interest
(20,246
)
 
(15,629
)
 
(16,906
)
Interest income
(2,607
)
 
(3,237
)
 
(2,590
)
Net interest expense
$
8,333

 
$
13,751

 
$
18,778