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Fair Value Measurements - Schedule of Fair Value Measurements - Footnotes (Details) - Derivative
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents, original maturities less than 90 days  
Interest Rate Caps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of interest rate cap agreements 1 4