Quarterly report pursuant to Section 13 or 15(d)

Per Share Data - Computations of Basic and Diluted Per Share (Details)

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Per Share Data - Computations of Basic and Diluted Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Basic weighted-average shares (in shares) 196,557,837 192,304,828 196,230,136 192,287,816
Effect of dilutive securities:        
Dilutive potential common shares (in shares) 13,298,099 0 0 0
Weighted average common shares outstanding and dilutive potential common shares (in shares) 209,855,936 192,304,828 196,230,136 192,287,816
Options        
Effect of dilutive securities:        
Options to purchase and restricted shares - common stock (in shares) 12,050,453 0 0 0
Restricted shares        
Effect of dilutive securities:        
Options to purchase and restricted shares - common stock (in shares) 1,247,646 0 0 0