Comprehensive Income/Loss (Details1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			$ (4,526)	$ (4,486)
Net change in other comprehensive income (loss)	337	741	(2,534)	897
Ending Balance	(7,060)	(3,589)	(7,060)	(3,589)
Deferred Gain on Hedge Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			859	1,004
Net change in other comprehensive income (loss)			(108)	(109)
Ending Balance	751	895	751	895
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			5,478	6,574
Net change in other comprehensive income (loss)			(5,514)	582
Ending Balance	(36)	7,156	(36)	7,156
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			(9,577)	(10,804)
Net change in other comprehensive income (loss)			3,015	355
Ending Balance	(6,562)	(10,449)	(6,562)	(10,449)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			(1,286)	(1,260)
Net change in other comprehensive income (loss)			73	69
Ending Balance	$ (1,213)	$ (1,191)	$ (1,213)	$ (1,191)