Investments (Details 2) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cumulative credit loss
Beginning of period	[1]	$ 13,703	$ 7,844
New credit losses	[1]	0	1,824
Increases to previously recognized credit losses	[1]	726	0
Gains related to securities sold or paid down during the period	[1]	(2)	0
End of period	[1]	$ 14,427	$ 9,668

[1] The cumulative credit loss amounts exclude OTTI losses on securities held as of the periods indicated that the Company intended to sell or it was more likely than not that the Company would be required to sell the security before the recovery of the amortized cost basis.