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

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of long-term debt [Table Text Block]

Our long-term debt consisted of the following:

	June 30, 2018		December 31, 2017
Revolving credit facility
Swing-line borrowings	$	1,000	$	—
LIBOR borrowings	138,000		100,000
	139,000		100,000
Senior unsecured notes	18,000		18,000
Term loans	8,937		16,242
Capital leases	2,551		2,510
	168,488		136,752
Less debt issuance costs	637		725
Less current portion	9,944		16,817
	$	157,907	$	119,210