CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended	1 Months Ended	2 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 18, 2014	Aug. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortization of net actuarial gain, tax	$ 50
Predecessor
Amortization of net actuarial gain, tax		$ 0	$ 0	$ 0	$ 0	$ 0