Commitments and Contingencies - Repurchase Reserves (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Repurchase Reserve [Roll Forward]
Beginning balance	$ 381	$ 1,883
(Recovery of)/Provision for repurchases	31	(1,502)
Settlements	(66)	0
Total repurchases reserve	$ 346	$ 381