Accumulated Other Comprehensive Loss Reclassification Adjustments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Amounts reclassified from AOCI	$ 373
Interest Rate Swap [Member]
Amounts reclassified from AOCI	(57)		(60)
Derivatives, reclassification adjustment for amounts recognized in net income, tax	(30)		(33)
Pension Benefits [Member]
Net actuarial loss amortization (net of tax of $282)	525	[1]	3,335
Net actuarial loss amortization, tax	282		2,192
Net prior service benefit amortization (net of tax of $(33))	(63)	[1]	(63)
Net prior service benefit amortization, tax	(33)		(41)
Amounts reclassified from AOCI	462
Available-for-sale Securities [Member]
Reclassification adjustment for amounts recognized in net income (net of tax of $(18))	(32)		(56)
Available for sale securities, reclassification adjustment for amounts recognized in net income, tax	$ (18)		$ (30)

[1] Pension and other post-retirement benefits AOCI components are included in the computation of net periodic benefit cost (refer to note 12 to the condensed consolidated financial statements).