Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivative Instrument (Derivative Financial Instrument, Narrative) (Details)

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Fair Value Measurements and Derivative Instrument (Derivative Financial Instrument, Narrative) (Details)
Feb. 02, 2015
USD ($)
$ / shares
shares
Stock Appreciation Rights (SARs)  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Stock appreciation rights, expiration period 8 years
Common Stock Class A | Stock Appreciation Rights (SARs)  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Stock appreciation rights (in shares) | shares 3,000,000
Exercise price of stock appreciation rights (USD per share) | $ / shares $ 13.00
Unsecured Debt | Searchlight ALX, LP Promissory Note  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Debt face amount | $ $ 75,000,000.0