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COMMITMENTS AND CONTINGENCIES - Commitments and obligations (Details)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
ft²
a
Sep. 30, 2017
USD ($)
Commitments and Contingencies    
Aggregate contractual obligations   $ 126.0
Aggregate operating lease commitments   17.4
Purchase Agreement    
Commitments and Contingencies    
Acres of land | a 49  
Purchase agreement to acquire real estate property $ 39.1  
Area of real estate property | ft² 1,000,000  
Guaranteed Maximum Purchase Price $ 38.1  
Guaranteed maximum construction price, remaining amount   6.2
Raw materials    
Commitments and Contingencies    
Purchase Commitments   $ 28.1
Period over which obligations will be paid   1 year