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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Commitments and Contingencies.        
Total lease expense $ 3,529 $ 3,700 $ 7,166 $ 7,545
Lease payments to related party $ 383 $ 398 $ 763 $ 797