Consolidated Statement Of Changes In Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Preferred Stock [Member]	Additional paid-in capital [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]	Distributions in excess of net income [Member]	Noncontrolling Interests [Member]
Balance (in shares) at Dec. 31, 2013		53,361,261	13,850,000
Other Changes During Period Shares		19,685
Stockholders' Equity, Other				$ (1,054)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	1,751,970	552	139	2,093,370	(66,096)	14,225	(290,597)	377
Issuance of nonvested shares, net		280,193
Issuance of nonvested shares, net	(683)	(3)		(3,571)	(2,891)
Amortization of nonvested shares	(3,408)			(3,408)
Share option expense	729			729
Foreign currency translation adjustment	(632)					(632)
Change in unrealized gain/loss on derivatives	(2,336)					(2,336)
Net income	84,292						84,292
Issuances of common shares (in shares)		1,569,170
Issuances of common shares	79,756	15		79,741
Stock option exercises, net (in shares)	24,602	24,602
Stock option exercises, net	(24)	0		(1,004)	(1,028)
Dividends to common and preferred shareholders	(102,974)						(102,974)
Balance (in shares) at Jun. 30, 2014		55,254,911	13,850,000
Balance (in shares) at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity	1,751,970		139					377
Foreign currency translation adjustment	7,856
Net income	$ 40,760
Balance (in shares) at Jun. 30, 2014			13,850,000