Fair Value of Financial Assets and Financial Liabilities (Level 3 Reconciliation) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	$ 844,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	1,443,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(1,521,000)	(1,196,000)
Included in earnings	0	0
Included in other comprehensive income	78,000	325,000
Purchases:	0	0
Sales:	0	0
Issuances:	0	0
Settlements:	0	0
Transfers in/(out) of Level 3	0	0
Ending balance	1,443,000	(1,521,000)
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held as of March 31, 2013:	0	0
Fair Value, Measurements, Recurring [Member] | Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance:	829,000	642,000
Included in earnings	0	0
Included in other comprehensive income	15,000	44,000
Purchases:	0	143,000
Sales:	0	0
Issuances:	0	0
Settlements:	0	0
Transfers in/(out) of Level 3	0	0
Ending balance	844,000	829,000
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held as of March 31, 2013:	$ 0	$ 0