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Earnings Per Common Share - Computation of Basic and Diluted Net Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Weighted average number of common shares outstanding - basic (in shares) 73,074 72,364
Effect of dilutive securities (in shares) 872 650
Weighted average number of common shares outstanding - diluted (in shares) 73,946 73,014