Fair Value Measurements and Derivative Instruments Fair Value Measurements and Derivative Instruments (Derivative Financial Instruments) (Details) - USD ($)		9 Months Ended
	Feb. 02, 2015	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Stock Appreciation Rights, Expiration Date	8 years
Unsecured Debt [Member] | Searchlight ALX, LP Promissory Note [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt face amount	$ 75,000,000.0
Stock Appreciation Rights (SARs) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value measurement with unobservable inputs, beginning balance		$ 0
Issuance		21,660,000
Fair value adjustment at end of period, included in Other Income (Expense)		5,040,000
Fair value measurement with unobservable inputs, ending balance		$ 26,700,000
Stock Appreciation Rights (SARs) [Member] | Common Stock - Class A [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Stock Appreciation Rights	3,000,000
Exercise price of stock appreciation rights (per share)	$ 13.00
Stock Appreciation Rights (SARs) [Member] | Common Stock - Class A [Member] | Searchlight ALX, LP Promissory Note [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Stock Appreciation Rights	3,000,000
Exercise price of stock appreciation rights (per share)	$ 13.00