Fair Value, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Beginning of period balance	$ 12,208	$ 0
Total gains or losses (realized or unrealized) included in income	47	0
Purchases	2,163	0
Settlements	(8,027)	0
Transfers into level 3	995	12,208
Transfers out of level 3	(981)	0
End of period balance	$ 6,405	$ 12,208