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Secured and unsecured senior debt Schedule of interest expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest expense incurred        
Gross interest $ 32,680 $ 32,959 $ 92,551 $ 96,668
Capitalized interest (12,125) (16,788) (35,440) (46,499)
Interest $ 20,555 $ 16,171 $ 57,111 $ 50,169