Benefit Plans (Amounts recognized as a component of OCI) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of other comprehensive income      
Net change in unrecognized actuarial loss and prior service cost $ 2,328 $ (329) $ (1,971)
Tax effect (791) 111 671
Change in unrealized pension cost, net of tax $ 1,537 $ (218) $ (1,300)