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Summary of Significant Accounting Policies (Details 8)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Interest rate swap
USD ($)
instrument
Dec. 31, 2011
Interest rate swap
USD ($)
Dec. 31, 2012
Interest rate cap
USD ($)
instrument
Dec. 31, 2012
USD-Yen currency forward contract
USD ($)
Dec. 31, 2012
USD-Yen currency forward contract
JPY (¥)
Dec. 31, 2011
USD-Euro currency forward contract
USD ($)
Dec. 31, 2011
USD-Euro currency forward contract
EUR (€)
Derivative financial instruments                  
Number of Instruments     3   6        
Notional Amount     $ 483,700,000   $ 442,400,000       € 141,300,000
Interest rate net derivative liability, fair value     1,500,000 10,000,000          
Notional amount, foreign currency derivatives (in Japanese Yen)             3,300,000,000    
Asset value of forwards included in deferred costs and other assets           3,000,000   14,900,000  
Gross accumulated other comprehensive income or loss related to derivative activities $ 78,139,000 $ 115,833,000