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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consists of the following (in thousands): 
 
December 31,
 
2018
 
2017
 
 
 
 
Term Loan (matures June 2020)
$
33,693

 
$
97,500

2022 Notes (mature May 2022)
125,000

 
125,000

2023 Notes (mature September 2023)
125,000

 
—

2032 Notes (redeemed May 2018)
—

 
60,115

MARAD Debt (matures February 2027)
70,468

 
77,000

Nordea Q5000 Loan (matures April 2020)
125,000

 
160,714

Unamortized debt discounts
(28,802
)
 
(14,406
)
Unamortized debt issuance costs
(10,044
)
 
(10,296
)
Total debt
440,315

 
495,627

Less current maturities
(47,252
)
 
(109,861
)
Long-term debt
$
393,063

 
$
385,766
Schedule of maturities of long-term debt outstanding
Scheduled maturities of our long-term debt outstanding as of December 31, 2018 are as follows (in thousands): 
 
Term
Loan (1)
 
2022
Notes
 
2023
Notes
 
MARAD
Debt
 
Nordea
Q5000
Loan
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
Less than one year
$
4,680

 
$
—

 
$
—

 
$
6,858

 
$
35,714

 
$
47,252

One to two years
29,013

 
—

 
—

 
7,200

 
89,286

 
125,499

Two to three years
—

 
—

 
—

 
7,560

 
—

 
7,560

Three to four years
—

 
125,000

 
—

 
7,937

 
—

 
132,937

Four to five years
—

 
—

 
125,000

 
8,333

 
—

 
133,333

Over five years
—

 
—

 
—

 
32,580

 
—

 
32,580

Gross debt
33,693

 
125,000

 
125,000

 
70,468

 
125,000

 
479,161

Unamortized debt discounts (2)
—

 
(11,043
)
 
(17,759
)
 
—

 
—

 
(28,802
)
Unamortized debt issuance costs (3)
(372
)
 
(1,765
)
 
(2,862
)
 
(4,025
)
 
(1,020
)
 
(10,044
)
Total debt
33,321

 
112,192

 
104,379

 
66,443

 
123,980

 
440,315

Less current maturities
(4,680
)
 
—

 
—

 
(6,858
)
 
(35,714
)
 
(47,252
)
Long-term debt
$
28,641

 
$
112,192

 
$
104,379

 
$
59,585

 
$
88,266

 
$
393,063

(1)
Term Loan borrowing pursuant to the Credit Agreement matures in June 2020. Scheduled principal repayments of the Term Loan have been adjusted to reflect prepayments made in March 2018.
(2)
The 2022 Notes will increase to their face amount through accretion of the debt discount through May 2022. The 2023 Notes will increase to their face amount through accretion of the debt discount through September 2023.
(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,
 
2018
 
2017
 
2016
 
 
 
 
 
 
Interest expense
$
32,617

 
$
38,274

 
$
45,110

Interest income
(3,237
)
 
(2,590
)
 
(2,086
)
Capitalized interest
(15,629
)
 
(16,906
)
 
(11,785
)
Net interest expense
$
13,751

 
$
18,778

 
$
31,239