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

Derivative Financial Instruments (Schedule of Effect of Derivatives Recorded in Interest Expense and Other Expenses) (Details)

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Derivative Financial Instruments (Schedule of Effect of Derivatives Recorded in Interest Expense and Other Expenses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification to Consolidated Income Statements:      
Reclassification of amounts previously recorded in AOCI   $ 3,126  
Effect from derivatives $ 18,118 16,695 $ (11,709)
Interest Rate Caps, Floors And Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives not designated as hedges $ 18,118 $ 13,569 $ (11,709)