Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016	Apr. 12, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Successor [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 1,331			$ 2,440
Successor [Member] | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 204			$ 378
Predecessor [Member]
401(k) Plan [Abstract]
401(k) Plan expense		$ 1,593	$ 1,090		$ 3,783
Predecessor [Member] | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense		$ 319	$ 205		$ 736