Fair Value, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 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	59	0
Purchases	2,123	0
Settlements	(7,282)	0
Transfers into level 3	26	12,208
End of period balance	$ 7,134	$ 12,208