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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Weighted Average Number of Shares Outstanding, Basic 81,885,262 82,286,295 82,067,519 82,317,244
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 90,512 94,641 98,212 100,313
Weighted Average Number of Shares Outstanding, Diluted 81,975,774 82,380,936 82,165,731 82,417,557