Basis of Presentation and Consolidation (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (42,025)	[1]		$ (45,379)	[1]
Other comprehensive income before reclassifications	524	[1]		4,048	[1]
Amounts reclassified from accumulated other comprehensive income	(85)	[1]		(255)	[1]
Other comprehensive income (loss)	439	[1]	391	3,793	[1]	483
Ending balance	(41,586)	[1]	(42,607)	(41,586)	[1]	(42,607)
Losses on Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(764)	[1]		(902)	[1]
Other comprehensive income before reclassifications	56	[1]		194	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]		0	[1]
Other comprehensive income (loss)	56	[1]		194	[1]
Ending balance	(708)	[1]		(708)	[1]
Investment in Debt Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,872	[1]		2,569	[1]
Other comprehensive income before reclassifications	0	[1]		303	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]		0	[1]
Other comprehensive income (loss)	0	[1]		303	[1]
Ending balance	2,872	[1]		2,872	[1]
Defined Benefit Plan Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(44,133)	[1]		(47,046)	[1]
Other comprehensive income before reclassifications	468	[1]		3,551	[1]
Amounts reclassified from accumulated other comprehensive income	(85)	[1]		(255)	[1]
Other comprehensive income (loss)	383	[1]		3,296	[1]
Ending balance	$ (43,750)	[1]		$ (43,750)	[1]

[1] All amounts are net of tax. Amounts in parentheses indicates debits