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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Preferred Shares [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Common Shares [Member]
      
Issuance of common shares related to stock plans 119,216 322,481 178,081
Issuance of common shares related to exercise of warrants     10,000,000
Issuance of common shares for cash offering 44,020,236 36,334,587 9,500,000
Paid-in Capital [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Accumulated Distributions in Excess of Net Income [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Deferred Compensation Obligation [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Accumulated Other Comprehensive Loss [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Treasury Stock at Cost [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0
Non-Controlling Interests [Member]
      
Issuance of common shares related to stock plans 0 0 0
Issuance of common shares related to exercise of warrants     0
Issuance of common shares for cash offering 0 0 0