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CONSOLIDATED INCOME STATEMENTS (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]    
Expense of restructuring activities [1] $ 4.2 $ 0.0
[1] Throughout 2017, the Company initiated a restructuring plan that impacted its corporate office workforce. As a result, the Company recognized a restructuring charge of approximately $4.2 million related to severance and other termination benefits.