Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
401(k) Plan [Abstract]
401(k) Plan expense	$ 1,268	$ 1,201	$ 2,693	$ 2,569
Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 200	$ 200	$ 500	$ 500