Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Allowance for Doubtful Accounts Receivable, Current	$ 1,947	$ 2,259
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)	35,484,312	35,374,121
Common shares, treasury (in shares)	7,068,145	7,178,336