Debt - Recorded Expenses with Respect to Long-term Debt (Details) (USD $)	12 Months Ended						6 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013
Line of Credit Facility [Line Items]
Interest expense	$ 31,724,000		$ 34,138,000		$ 1,194,000
Amortization of debt issuance cost	13,217,000	[1]	16,832,000	[1]	276,000	[1]
Commitment fee	1,575,000		792,000		1,034,000
Total	46,516,000		51,762,000		2,504,000
Writedown of debt issuance costs	9,552,000		13,209,000		0
First Lien Credit Facility [Member]
Line of Credit Facility [Line Items]
Writedown of debt issuance costs							13,200,000
Jefferies Finance LLC and Goldman Sachs Bank USA [Member] | First Lien Credit Facility [Member]
Line of Credit Facility [Line Items]
Writedown of debt issuance costs	9,600,000
Early principal payments	235,000,000		300,000,000				300,000,000
Writedown of Debt Issuance Costs [Member]
Line of Credit Facility [Line Items]
Writedown of debt issuance costs	9,600,000		13,200,000
Other Expense [Member]
Line of Credit Facility [Line Items]
Amortization of debt issuance cost	$ 3,600,000		$ 3,600,000

[1] Of the $13.2 million of amortization of debt issuance cost incurred during 2014, $9.6 million is included in Writedown of debt issuance costs and $3.6 million is in Other expenses. The writedown amounts were incurred as a result of the $235.0 million repayment of the First Lien Credit Facility made in 2014.