Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Allowances for accounts receivable	$ 1,555	$ 1,563
Shareholders’ Equity
Preferred Shares, shares authorized (in shares)	1,000,000	1,000,000
Preferred Shares, shares issued (in shares)	0	0
Preferred Shares, shares outstanding (in shares)	0	0
Common Shares, shares authorized (in shares)	60,000,000	60,000,000
Common Shares, shares outstanding (in shares)	30,252,632	30,019,561
Common shares, treasury (in shares)	7,699,825	7,932,896