DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of long-term debt instruments

Debt consists of the following: 

	December 31,
	2017		2016
8.125% notes due 2018, net of unamortized discount and deferred costs of $0 and $1,406	$	—	$	80,213
OBS term loan, due 2019, net of unamortized discount and deferred costs of $7,037 and $11,102	448,251		444,186
7.5% Election 2 notes due 2021, net of unamortized discount and deferred costs of $6 and $8	295		293
7.50% notes due 2024	390		390
Total debt	448,936		525,082
Less current installments of long-term debt	28,160		—
Total long-term debt	$	420,776	$	525,082

Schedule of exit financing facility

The applicable margins and floor interest rates for the Exit Financing Facilities is as follows:

Facility	OBS ABL Facility		OBS Term Loan
Rate	ABR	LIBOR	ABR	LIBOR
Floor	None	None	2.00%	1.00%
Applicable Margin	1.25% - 1.75%	2.25% - 2.75%	3.25%	4.25%

Contractual obligation, fiscal year maturity schedule

The following table summarizes interest expense, including amortization of issuance and deferred financing costs, commitment, administrative and other fees, recognized during the three years ended December 31, 2017 with respect to the Company’s debt facilities:

	Years Ended December 31,
Debt facility	2017		2016		2015
8.125% notes due 2018	$	5,568	$	10,200	$	22,779
OBS Facilities, due 2019	30,308		32,460		37,666
7.50% notes due 2021-2024	102		121		9,890
Total expense on debt facilities	$	35,978	$	42,781	$	70,335

As of December 31, 2017, the aggregate annual principal payments required to be made on the Company's debt are as follows: 

2018	$	28,166
2019	427,123
2020	—
2021	301
2022	—
Thereafter	390
Total	$	455,980