Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Anti-dilutive Shares (Details)

v3.8.0.1
Earnings per Share - Anti-dilutive Shares (Details) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Performance based restricted stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive (shares) 1,751,022 1,773,693
Performance based stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive (shares) 586,253 650,985
Restricted stock awards and restricted units    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive (shares) 0 477,720
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive (shares) 621,747 1,539,536