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Fair Value of Derivatives and Financial Instruments (Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk) (Details) - Designated as Hedging Instrument | Dec. 31, 2017 USD ($) Contract
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Interest Rate Cap |
Derivative |
Number of Instruments | Contract | 1
Derivative, Notional Amount | $ | $ 25,000,000
Interest Rate Swap |
Derivative |
Number of Instruments | Contract | 10
Derivative, Notional Amount | $ | $ 550,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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