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Commitments and Contingencies - Leases (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
lease
Mar. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Number of leases that require rent to be paid based on contingent events | lease 0  
Rent expense | $ $ 7.3 $ 6.7