(8) Debt

Debt consisted of the following (in thousands):

	As of
	June 30,			December 31,
	2017			2016

Term loan	$	158,813		$	165,000
Less unamortized discount		(466	)		(534	)
Less unamortized term loan debt issuance costs		(718	)		(824	)
Less current portion of long-term debt		(14,438	)		(12,375	)
Long-term debt, net, less current portion	$	143,191		$	151,267

Principal payments on debt are due as follows (in thousands):

2017 (remaining)	$	6,188
2018		16,500
2019		16,500
2020		20,625
2021		99,000
Total	$	158,813

The estimated fair value of the Company’s term loan based on Level 2 inputs using the market approach, which is primarily based on rates at which the debt is traded among financial institutions, approximates the carrying value as of June 30, 2017 and December 31, 2016.