Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands		Total	Class A Common Stock	Common Stock Class A Common Stock		Additional Paid-In Capital		Cumulative Dividends in Excess of Earnings	Total Stockholders’ Equity	Noncontrolling Interests
Beginning balance, shares at Dec. 31, 2013	[1]			118,440,000
Beginning balance at Dec. 31, 2013		$ 1,399,749		$ 1,184	[1]	$ 2,128,082	[1]	$ (742,060)	$ 1,387,206	$ 12,543
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)	[1]			771,000
Issuance of common stock		17,742		$ 8	[1]	17,734	[1]		17,742
Share-based award transactions, net (in shares)	[1]			254,000
Share-based award transactions, net		3,279		$ 3	[1]	3,276	[1]		3,279
Repurchase and cancellation of common stock (in shares)	[1]			(29,000)
Repurchase and cancellation of common stock		(572)		$ (1)	[1]	(571)	[1]		(572)
Redemption of noncontrolling interest (in shares)	[1]			36,000
Redemption of noncontrolling interest		0				362	[1]		362	(362)
Dividends		(103,951)						(103,097)	(103,097)	(854)
Net income		24,415						24,179	24,179	236
Ending balance, shares at Sep. 30, 2014	[1]			119,472,000
Ending balance at Sep. 30, 2014		1,340,662		$ 1,194	[1]	2,148,883	[1]	(820,978)	1,329,099	11,563
Beginning balance, shares at Dec. 31, 2014			125,087,268	125,087,000
Beginning balance at Dec. 31, 2014		1,476,421		$ 1,251		2,281,932		(836,044)	1,447,139	29,282
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)				1,800,000
Issuance of common stock		43,649		$ 18		43,631			43,649
Share-based award transactions, net (in shares)				200,000
Share-based award transactions, net		4,462		$ 2		4,460			4,462
Repurchase and cancellation of common stock (in shares)				(49,000)
Repurchase and cancellation of common stock		(1,322)		$ (1)		(1,321)			(1,322)
Dividends		(111,766)						(110,071)	(110,071)	(1,695)
Net income		22,907						22,559	22,559	348
Ending balance, shares at Sep. 30, 2015			127,037,807	127,038,000
Ending balance at Sep. 30, 2015		$ 1,434,351		$ 1,270		$ 2,328,702		$ (923,556)	$ 1,406,416	$ 27,935

[1] For the nine months ended September 30, 2014, amounts have been adjusted retroactively to reflect a 1-for-2 reverse stock split effected on December 15, 2014.