Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Common stock
Common stock, no par value (in dollars per share)	$ 0.00	$ 0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	34,345,073	34,353,014
Common stock, shares outstanding	34,345,073	34,353,014