Comprehensive Income/Loss (Comprised of the following Components) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			$ (7,434)	$ (4,526)
Net change in other comprehensive income	3,361	(2,928)	5,741	(2,871)
Ending Balance	(1,693)	(7,397)	(1,693)	(7,397)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			(2,023)	5,478
Net change in other comprehensive income			4,312	(5,368)
Ending Balance	2,289	110	2,289	110
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			(5,698)	(9,577)
Net change in other comprehensive income			1,579	2,526
Ending Balance	(4,119)	(7,051)	(4,119)	(7,051)
Deferred Gain on Hedge Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			715	859
Net change in other comprehensive income			(72)	(72)
Ending Balance	643	787	643	787
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Rollforward]
Beginning Balance			(428)	(1,286)
Net change in other comprehensive income			(78)	43
Ending Balance	$ (506)	$ (1,243)	$ (506)	$ (1,243)