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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Leases        
Total lease expense $ 3,753 $ 3,250 $ 14,144 $ 10,416
Lease payments to related party $ 360 $ 377 $ 1,080 $ 1,140