Fair Value Measurements and Derivative Instruments Fair Value Measurements and Derivative Instruments (Derivative Financial Instruments) (Details) - USD ($)		12 Months Ended
	Feb. 02, 2015	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Stock Appreciation Rights, Expiration Date	8 years
Fair Value Assumptions, Expected Volatility Rate		40.00%
Fair Value Assumptions, Risk Free Interest Rate		2.10%
Unsecured Debt [Member] | Searchlight ALX, LP Promissory Note [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Face amount of debt	$ 75,000,000.0
Stock Appreciation Rights (SARs)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		$ 32,820,000	$ 0
Issuance		21,660,000
Stock Appreciation Rights (SARs) | Other Nonoperating Income (Expense) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value adjustment at end of period, included in Other Income (Expense)		$ 11,160,000
Class A Common Stock | Stock Appreciation Rights (SARs)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Rights outstanding	3,000,000
Exercise price of rights	$ 13.00
Class A Common Stock | Stock Appreciation Rights (SARs) | Searchlight ALX, LP Promissory Note [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Rights outstanding	3,000,000
Exercise price of rights	$ 13.00
Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assumptions, Expected Term		4 years
Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assumptions, Expected Term		8 years