Subsequent Events (Details) - USD ($) $ in Thousands			9 Months Ended
	Oct. 22, 2015	Oct. 14, 2015	Sep. 30, 2015	Sep. 30, 2014
Subsequent Event [Line Items]
Aggregate dividends, distributions, and dividend equivalents paid to common stockholders and common unitholders			$ 93,910	$ 88,540
Repayments of Secured Debt			$ 67,335	$ 7,315
Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate dividends, distributions, and dividend equivalents paid to common stockholders and common unitholders		$ 33,300
Repayments of Secured Debt	$ 90,100