Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Successor [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 1,668
Successor [Member] | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 279
Predecessor [Member]
401(k) Plan [Abstract]
401(k) Plan expense		$ 1,374
Predecessor [Member] | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense		$ 282