Pension Plan and Employee Benefits, 401 (K) Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
401(k) Plan [Abstract]
401 (k) Plan expense	$ 963	$ 945	$ 3,303	$ 2,998
Other Subsidiaries [Member]
401(k) Plan [Abstract]
401 (k) Plan expense	$ 200	$ 200	$ 800	$ 700