Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock no par value
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, no par value
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	126,866,000	103,396,000
Common stock, shares outstanding	126,866,000	102,776,000
Treasury stock, shares		620,000