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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Payable      
Purchase of property and equipment incurred $ 6.6 $ 0.4 $ 0.5
Accrued Expenses      
Purchase of property and equipment incurred $ 2.7 $ 2.1