Derivatives (Gain Loss on Interest Rate Swaps Included in Earnings) (Details) (Fair Value Hedging [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Related long-term debt	$ 1,376,000	$ 3,681,000	$ 1,510,000	$ 4,087,000
Net impact on Condensed Consolidated Statements of Operations	(347,000)	3,329,000	(569,000)	3,748,000
Designated as Hedging Instrument [Member] | Loss on Redemption of Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on Condensed Consolidated Statements of Operations	0	3,502,000	0	3,502,000
Designated as Hedging Instrument [Member] | Other Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on Condensed Consolidated Statements of Operations	(347,000)	(173,000)	(569,000)	246,000
Designated as Hedging Instrument [Member] | Interest rate agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap	(1,723,000)	(352,000)	(2,079,000)	(339,000)
New Rate Agreement [Member] | Senior Notes [Member] | Interest rate agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 45,000,000		$ 45,000,000