Derivative Instruments-Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Offsetting Derivative Assets
Gross amounts recognized	$ 2,742	$ 2,818
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	2,742	2,818
Financial instruments	37	1,664
Financial collateral pledged	0	0
Net amounts	2,705	1,154
Offsetting Derivative Liabilities
Gross amounts recognized	3,792	3,315
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	3,792	3,315
Financial instruments	37	1,664
Financial collateral pledged	3,540	0
Net amounts	$ 215	$ 1,651