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Earnings Per Share - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Weighted average shares outstanding — basic (in shares) 140,531,426 138,422,953 140,351,927 137,390,809
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share 300,000      
Dividends $ 0 $ 0 $ 0 $ 0