Long-Term Debt and Financing Arrangements (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

	June 30,			December 31,
	2019			2018
	(in thousands except principal and interest payments)
Secured Equipment Notes due on various dates in 2024 commencing on various dates in 2017, 2018 and 2019; interest is paid monthly at a fixed annual rate between 2.83% and 3.59%	$	28,699		$	11,658
Secured Equipment Notes due on various dates in 2023 commencing on various dates in 2016, 2017, 2018 and 2019; interest is paid monthly at a fixed annual rate between 2.23% and 4.16%		173,468			192,858
Secured Equipment Notes due on various dates in  2022 commencing on various dates from 2015 to 2017; interest is paid monthly at a fixed annual rate of between 2.16% and 2.87%		21,247			24,092
Secured Equipment Notes due on various dates in 2021 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96%		45,475			55,855
Secured Equipment Notes due on various dates in 2020 commencing on various dates from 2013 to 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.78%		23,378			32,904
Secured Equipment Notes due on various dates in 2019 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 2.05% and 2.62%		5,528			13,417
		297,795			330,784
Less current portion		(98,601	)		(101,713	)
Total long-term debt	$	199,194		$	229,071