Earnings Per Share (Tables)
|12 Months Ended|
Dec. 31, 2017
|Earnings Per Share [Abstract]|
|Earnings Per Share Computations||
Earnings per share computations are based upon the following table:
Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).
Reference 1: http://www.xbrl.org/2003/role/presentationRef