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Commitments and Contingencies (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 3.3 $ 3.1 $ 3.1
Minimum      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Renewal Term 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Renewal Term 6 years