Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Consolidated Balance Sheets
Common stock, no par value	$ 0	$ 0
Common stock, issued shares	0	2,719,695
Common stock, outstanding shares	0	2,719,695
Ordinary stock, nominal value (in dollars per share)	$ 0.01
Ordinary stock, authorized shares	1,000,000,000
Ordinary stock, issued shares	36,707,685
Ordinary stock, outstanding shares	36,707,685
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, authorized shares	100,000,000
Preferred stock, issued shares	0
Preferred stock, outstanding shares	0