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	14,754				14,754
Dividends declared on common stock	(12,929)			(4,986)	(7,943)
Dividends earned on preferred stock	(6,811)				(6,811)
Redemption of operating partnership units	68,900		3	68,897
Redemption of operating partnership units, shares	2,850,000
Common stock repurchase	(37,792)		(1)	(37,791)
Common stock repurchase, shares	(1,632,673)
Issuance of stock awards	0		0	0
Issuance of stock awards, shares	136,924
Retirement and forfeiture of stock awards	(1,117)		0	(1,117)
Retirement and forfeiture of stock awards, shares	(50,063)
Amortization of deferred compensation costs	1,984			1,984
Adjustments to redeemable noncontrolling interests – operating partnership	(3,011)			(3,011)
Balance at Mar. 31, 2013	$ 1,290,410	$ 351,250	$ 65	$ 939,095	$ 0
Balance, shares at Mar. 31, 2013	64,645,117