Fair Value of Financial Instruments - Summary of Recurring Level III Assets (Details) - Level III - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 2,769	$ 1,790	$ 1,583	$ 1,020
Realized and unrealized gains (loss) included in earnings	856	(137)	2,042	633
Balance, end of period	$ 3,625	$ 1,653	$ 3,625	$ 1,653