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Equity Investments (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Mar. 15, 2013
GOV
Jun. 30, 2012
GOV
Jun. 30, 2013
GOV
Jun. 30, 2012
GOV
Dec. 31, 2012
GOV
Jun. 30, 2013
AIC
company
Jun. 30, 2012
AIC
Jun. 30, 2013
AIC
company
Jun. 30, 2012
AIC
Dec. 31, 2012
AIC
Jun. 30, 2013
AIC
SIR
Equity Investments                                
Subsidiary's attribution to equity method investment (as a percent)                               100.00%
Equity method investments, ownership percentage                   18.20% 25.00%   25.00%   25.00% 12.50%
Equity investments $ 11,407   $ 11,407   $ 184,711         $ 173,452 $ 11,407   $ 11,407   $ 11,259  
Equity in Earnings 159 2,829 4,421 5,787     2,680 4,111 5,593   159 149 310 194    
Equity investments, common shares owned           9,950,000                    
Gross proceeds received on issuance or sale of common shares           250,740                    
Net proceeds received on issuance or sale of common shares           239,576                    
Common stock price per share (in dollars per share)           $ 25.20                    
Gain on sale of equity investment     66,293     66,293                    
Cash distributions               4,279 8,358              
Amount invested in equity investee                     10,544   10,544      
Combined carrying value of equity method investments                     $ 11,407   $ 11,407      
Number of other companies which are shareholders of related party                     5   5