Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
401(k) Plan [Abstract]
401(k) Plan expense	$ 1,374	$ 1,425
Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 300	$ 300