Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Schedule of Notional Amounts and Fair Values of Derivatives Outstanding) (Details)

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Derivative Financial Instruments (Schedule of Notional Amounts and Fair Values of Derivatives Outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative assets, Fair Value $ 37,187 $ 18,965
Derivative liabilities, Fair Value   21
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative assets, Notional Amount 425,612  
Derivative assets, Fair Value 6,825  
Derivative liabilities, Notional Amount   23,223
Derivative liabilities, Fair Value   21
Nondesignated [Member] | Interest Rate Cap [Member]    
Derivative [Line Items]    
Derivative assets, Notional Amount 2,911,220 2,194,210
Derivative assets, Fair Value $ 30,362 $ 18,965