Other Income (Expense) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Income (Expense) [Line Items]
Debt interest rate	4.90%
Litigation settlement proceeds	$ 12,548	$ 0
Minimum
Other Income (Expense) [Line Items]
Retained interest, effective interest rate	3.70%
Maximum
Other Income (Expense) [Line Items]
Retained interest, effective interest rate	11.40%