Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit) (Details 2) (USD $)	8 Months Ended	12 Months Ended			4 Months Ended
	Dec. 31, 2010	Dec. 31, 2012		Dec. 31, 2011	Apr. 30, 2010 Predecessor
Foreign currency translation
Balance at the beginning of the period		$ (6,615,000)		$ 2,539,000
Net current period change	2,539,000	6,835,000	[1]	(9,154,000)	5,419,000
Balance at the end of the period	2,539,000	220,000		(6,615,000)
Cash flow hedges
Balance at the beginning of the period					1,270,000
Net current period change		(501,000)	[2]		(559,000)
Balance at the end of the period		(501,000)			711,000
Defined benefit retirement plan
Balance at the beginning of the period		(43,297,000)		(6,731,000)
Actuarial loss on defined benefit retirement plan	(6,731,000)	13,890,000	[3]	(36,566,000)	1,902,000
Balance at the end of the period	(6,731,000)	(29,407,000)		(43,297,000)
Accumulated other comprehensive income (loss)
Balance at the beginning of the period		(49,912,000)		(4,192,000)
Net current period change		6,334,000		(9,154,000)
Actuarial loss on defined benefit retirement plan	(6,731,000)	13,890,000	[3]	(36,566,000)	1,902,000
Balance at the end of the period	(4,192,000)	(29,688,000)		(49,912,000)
Foreign currency translation adjustment, tax		100,000
Defined benefit retirement plan, tax		19,200,000
Change in cash flow hedging, tax		$ 300,000

[1] Foreign currency translation adjustment presented net of taxes of $0.1 million for the year ended December 31, 2012.

[2] Change in cash flow hedging is reported net of taxes of $0.3 million for the year ended December 31, 2012.

[3] Defined benefit retirement plan is presented net of taxes of $19.2 million for the year ended December 31, 2012.