Consolidated Statements of Total Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	8 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Apr. 30, 2013	Dec. 31, 2012
Successor [Member]
Unrealized (loss) gain on securities, taxes	$ 0	$ 0
Gain (loss) on foreign currency translation, taxes	0	0
Amortization of postretirement benefit, taxes	0	0
Predecessor [Member]
Unrealized (loss) gain on securities, taxes			0	0
Gain (loss) on foreign currency translation, taxes			0	0
Amortization of postretirement benefit, taxes			$ 0	$ 0