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Summary of Significant Accounting Policies - Schedule of Derivative Instruments, Gain (Loss) on the Income Statement (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Other Comprehensive Income [Roll Forward]    
Beginning balance of OCI related to interest rate contracts $ 2,661 $ 1,162
Unrealized loss recognized in OCI due to change in fair value of interest rate contracts 791 1,547
Loss reclassified from OCI into income (as interest expense) (9,816) (183)
Net change in OCI (9,025) 1,364
Ending balance of accumulated OCI related to derivatives (6,364) 2,526
Allocation of OCI, non-controlling interests 3,508 (213)
Accumulated other comprehensive loss $ (2,856) $ 2,313