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Debt (Details) - Master Repurchase Agreement - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Maturity Date Nov. 24, 2015 Nov. 24, 2015
Maximum borrowing capacity $ 200,000 $ 200,000
Amount outstanding 153,804 15,249
Carrying value of collateral $ 241,689 $ 23,460
Interest rate 4.00% 4.00%