Acquisitions - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Mar. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Unpaid Principal Balance	$ 246,445,143		$ 266,648,244
Goodwill	$ 47,747		$ 367,911	$ 575,468
RCS Asset Purchase [Member]
Business Acquisition [Line Items]
Date of Asset Purchase Agreement	Dec. 08, 2015
Closing date of asset purchase	Jan. 28, 2016
Unpaid Principal Balance		$ 9,600,000
Goodwill		$ 3,800