Pension Plan and Employee Benefits, 401 (K) Plans (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Apr. 12, 2016	Jun. 30, 2017	Jun. 30, 2016	Apr. 12, 2016	Jun. 30, 2017
Successor
401(k) Plan [Abstract]
401(k) Plan expense		$ 1,204	$ 1,110		$ 2,872
Successor | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense		$ 198	$ 173		$ 477
Predecessor
401(k) Plan [Abstract]
401(k) Plan expense	$ 219			$ 1,593
Predecessor | Other Subsidiaries [Member]
401(k) Plan [Abstract]
401(k) Plan expense	$ 37			$ 319