Long-Term Debt and Commitments Related to Letters of Credit (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of long-term debt [Table Text Block]

Our long-term debt consisted of the following:

	March 31, 2018		December 31, 2017
Revolving credit facility
Swing-line borrowings	$	13,500	$	—
LIBOR borrowings	115,000		100,000
	128,500		100,000
Senior unsecured notes	18,000		18,000
Term loans	11,651		16,242
Capital leases	2,087		2,510
	160,238		136,752
Less debt issuance costs	681		725
Less current portion	13,155		16,817
	$	146,402	$	119,210