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Condensed Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common shares
Additional paid-in capital
Retained earnings
Shareholders' equity attributable to shareholders
Non-controlling interests
Balance, beginning of period at Dec. 31, 2012   $ 7,843 $ 762,430 $ 98,271   $ 59,777
Balance, beginning of period (in shares) at Dec. 31, 2012   78,432,132        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common shares (in shares)   0        
Issuance of common shares   0 0      
Share compensation expense     3,468      
Net income 100,653     100,653    
Income attributable to non-controlling interests 102,037         1,384
Contributions           26,164
Distributions           (35,129)
Balance, end of period at Jun. 30, 2013 1,024,861 7,843 765,898 198,924 972,665 52,196
Balance, end of period (in shares) at Jun. 30, 2013   78,432,132        
Balance, beginning of period at Dec. 31, 2013 1,510,396 10,389 1,055,690 325,582   118,735
Balance, beginning of period (in shares) at Dec. 31, 2013   103,888,916        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common shares (in shares)   42,470        
Issuance of common shares   4 (5)      
Share compensation expense     4,498      
Net income 71,071     71,071    
Income attributable to non-controlling interests 73,094         2,023
Contributions           6,151
Distributions           (51,001)
Balance, end of period at Jun. 30, 2014 $ 1,543,137 $ 10,393 $ 1,060,183 $ 396,653 $ 1,467,229 $ 75,908
Balance, end of period (in shares) at Jun. 30, 2014   103,931,386