Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 13,160	$ 7,738
Common shares, shares issued	175,426,824	122,375,955
Common shares, shares outstanding	175,201,895	122,375,955
Treasury shares	224,929	0