Debt (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Detail Comprising Debt and Related Book Values

A summary of the detail comprising the Company’s debt and the related book values for the respective periods presented is as follows (in thousands):

Description	June 30, 2018			December 31, 2017
11.00% Second-Priority Senior Secured Notes—due April 2022
Principal	$	390,868		$	—
Original issue discount, net of amortization		(8,906	)		—
Deferred financing costs, net of amortization		(1,920	)		—
7.50% Senior Secured Notes—due May 2022
Principal		6,060			—
Bank Credit Facility—due May 2022
Principal		240,000			—
Deferred financing costs, net of amortization		(8,478	)		—
4.20% Building Loan—due November 2030
Principal		10,778			—
11.00% Bridge Loans—due April 2022
Principal		—			172,023
Deferred financing costs, net of amortization		—			(2,185	)
9.75% Senior Notes—due July 2022
Principal		—			102,000
Deferred financing costs, net of amortization		—			(1,319	)
9.75% Senior Notes—due February 2018
Principal		—			24,977
Old Bank Credit Facility—due February 2019		—			403,000
Deferred financing costs, net of amortization		—			(938	)
Total debt	$	628,402		$	697,558
Less: current portion of long-term debt		(434	)		(24,977	)
Long-term debt, net of discount and deferred financing costs	$	627,968		$	672,581

A summary of the detail comprising the Company’s debt and the related book values for the respective periods presented is as follows (in thousands):

Description	December 31, 2017			December 31, 2016
11.00% Bridge Loans—due April 2022
Principal	$	172,023		$	—
Deferred financing costs, net of amortization		(2,185	)		—
9.75% Senior Notes—due July 2022
Principal		102,000			—
Deferred financing costs, net of amortization		(1,319	)		—
9.75% Senior Notes—due February 2018
Principal		24,977			300,000
Original issue discount, net of amortization		—			(806	)
Deferred financing costs, net of amortization		—			(4,230	)
Bank Credit Facility—due February 2019		403,000			408,000
Deferred financing costs, net of amortization		(938	)		(1,789	)
Total debt	$	697,558		$	701,175
Less: Current portion of long-term debt		(24,977	)		—
Long-term debt, net of discount and deferred financing costs	$	672,581		$	701,175