Risk Concentrations (Schedule of Foreign Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Successor [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	$ 174,097
Successor [Member] | Europe [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	61,408
Successor [Member] | Asia [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	55,634
Successor [Member] | North America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	43,831
Successor [Member] | Central and South America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	13,224
Successor [Member] | Brokered Sales [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries	$ 0
Predecessor [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		$ 280,879	$ 395,323	$ 611,917
Predecessor [Member] | Europe [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		113,888	170,314	277,565
Predecessor [Member] | Asia [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		68,536	96,523	156,057
Predecessor [Member] | North America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		56,594	40,315	78,445
Predecessor [Member] | Central and South America [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		41,861	55,323	20,496
Predecessor [Member] | Brokered Sales [Member]
foreign revenue [Line Items]
Sales to customers in foreign countries		$ 0	$ 32,848	$ 79,354