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Fair Value Measurements - Reconciliation of Fair Value Measurements for Guarantees (Details) - Guarantees - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Level 3 Fair Value Measurements - Guarantee        
Beginning balance $ 4,791 $ 9,480 $ 5,104 $ 0
Issuances 0 0 0 9,446
(Gain) loss on guarantee (1,055) 2,548 (1,368) 2,582
Ending balance $ 3,736 $ 12,028 $ 3,736 $ 12,028