Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt [Abstract]

Schedule of Debt [Table Text Block]

		2017		2016
Credit facilities	$	48,514	$	47,948
Industrial development bonds		15,000		15,000
Municipality-related loans		3,290		3,470
Other debt obligations (including capital leases)		—		58
		66,804		66,476
Short-term debt (including capital leases)		—		(58)
Current portion of long-term debt		(5,736)		(649)
	$	61,068	$	65,769

Schedule of Maturities of Long-term Debt [Table Text Block]

2018	$	5,736
2019		49,160
2020		694
2021		407
2022		282