Earnings Per Share

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Diluted weighted average shares is calculated as basic weighted average shares plus the effect, calculated using the treasury stock method, of assuming that performance and restricted share units and purchase match units have vested. All outstanding performance and restricted share units and purchase match units had a dilutive effect for the years ended December 31, 2016, 2015 and 2014.