Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Details)

v3.10.0.1
Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Weighted Average Number of Shares Outstanding, Basic 82,067,872 82,318,623 82,160,159 82,333,739
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 101,680 109,352 102,126 102,431
Weighted Average Number of Shares Outstanding, Diluted 82,169,552 82,427,975 82,262,285 82,436,170