Long-Term Debt and Financing Arrangements (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Outstanding Debt

	March 31,			December 31,
	2018			2017
	(in thousands except principal and interest payments)
Revolving line of credit	$	30,000		$	45,000
Secured Equipment Notes due on various dates in 2024 with monthly principal and interest payments between $403 and $83,000 commencing on various dates in 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.85% and 3.41%		13,119			13,586
Secured Equipment Notes due on various dates in 2023 with monthly principal and interest payments between $669 and $187,963 commencing on various dates in 2016, 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.23% and 3.66%		52,186			36,981
Secured Equipment Notes due on various dates in  2022 with monthly principal and interest payments between $3,030 and $254,190 commencing on various dates from 2015 to 2017; interest is paid monthly at a fixed annual rate of between 2.16% and 2.87%		28,709			30,301
Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $1,940 and $326,333 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96%		70,999			76,885
Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $6,175 and $398,496 commencing on various dates from 2013 to 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.78%		46,777			50,737
Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $1,594 and $325,050 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62%		30,748			36,178
Secured Equipment Notes due on various dates in 2018 with monthly principal and interest payments between $6,480 and $163,428 commencing on various dates in 2013 and 2014; interest is paid monthly at a fixed annual rate between 2.05% and 2.7%		2,019			2,406
		274,557			292,074
Less current portion		(80,004	)		(77,266	)
Total long-term debt	$	194,553		$	214,808