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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Commitments and Contingencies.        
Total lease expense $ 5,506 $ 3,529 $ 10,391 $ 7,166
Lease payments to related party $ 361 $ 383 $ 720 $ 763