Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	PreferredStock/Units [Member]	Common Class A [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2012	$ 1,266,432	$ 351,250	$ 63	$ 915,119	$ 0
Balance, shares at Dec. 31, 2012	63,340,929
Net income attributable to controlling interests	33,536				33,536
Dividends declared on common stock	(29,104)			(9,190)	(19,914)
Dividends earned on preferred stock	(13,622)				(13,622)
Redemption of operating partnership units	69,900		3	69,897
Redemption of operating partnership units, shares	2,891,269
Common stock repurchase	(37,792)		(1)	(37,791)
Common stock repurchase, shares	(1,632,673)
Issuance of stock awards	320		0	320
Issuance of stock awards, shares	152,931
Retirement and forfeiture of stock awards	(1,138)		0	(1,138)
Retirement and forfeiture of stock awards, shares	(51,480)
Amortization of deferred compensation costs	3,659			3,659
Adjustments to redeemable noncontrolling interests – operating partnership	(2,111)			(2,111)
Balance at Jun. 30, 2013	$ 1,290,080	$ 351,250	$ 65	$ 938,765	$ 0
Balance, shares at Jun. 30, 2013	64,700,976