Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
401(k) Plan [Abstract]
401(k) Plan expense	$ 1,090	$ 1,015	$ 3,783	$ 3,585
Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 200	$ 200	$ 700	$ 700