Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Common stock
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	34,205,542	34,353,014
Common stock, shares outstanding	34,205,542	34,353,014