Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common shares, par value (in shares)	$ 0.01	$ 0.01
Common shares, shares authorized (in shares)	150,000,000	150,000,000
Common shares, shares issued (in shares)	23,997,385	23,997,385
Common shares, shares outstanding (in shares)	23,997,385	23,997,385