Long-term debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Instruments [Abstract]

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

Future required principal payments for long-term debt as of December 31, 2015 are shown in the table below.

2016	$	3,286
2017	3,312
2018	1,514
2019	115
2020	116
Thereafter	72
	$	8,415