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Derivatives (Interest Rate Hedges) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Interest rate cap
Sep. 30, 2014
Interest rate swap
Oct. 31, 2012
Interest rate swap
Sep. 30, 2014
Terminated Interest Rate Swap
Sep. 30, 2014
Interest rate swaps
Derivative [Line Items]            
Derivative, Variable Interest Rate     2.00%      
Derivative, Notional Amount   $ 500,000,000 $ 27,584,000      
Notional Amount       28,000,000    
Derivative, Fixed Interest Rate     3.47%      
Derivative, Net Hedge Ineffectiveness Gain (Loss) (3,600,000) [1]          
Derivative, Cap Interest Rate   1.00%        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months         $ 100,000 $ 300,000
[1] For the nine months ended September 30, 2014, $3,634 is included in "Other expense" on the Company's Consolidated Statements of Operations (see Note 10). Included in "Interest expense" on the Company's Consolidated Statements of Operations are $(32) and $64 for the three and nine months ended September 30, 2014, respectively, and $80 and $231 for the three and nine months ended September 30, 2013, respectively.