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Commitments and Contingencies (Narratives) (Details)
$ in Millions
 6 Months Ended 54 Months Ended
Jun. 30, 2016
USD ($)
claim
Jun. 30, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
petition
Dec. 31, 2014
petition
Dec. 31, 2013
petition
Dec. 31, 2012
petition
Loss contingency            
Accrued liability for the outcomes of non-income based tax audits | $ $ 1.6 $ 1.6 $ 2.7      
Indemnification liability | $ 1.5 1.5        
Litigation and Claims            
Ad valorem tax benefit | $ 8.5 52.5        
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | $ 12.8 12.8        
Ad valorem tax benefit in litigation | $ $ 39.7 $ 39.7        
Number of petitions | petition     120 115 109 176
Number of cases appealed | claim 3 3        
Loss Contingencies            
Number of pending cases | claim 5 5        
Number of cases settled | claim 3          
Similar Judge            
Loss Contingencies            
Number of cases settled | claim 2          
United ISD            
Loss Contingencies            
Number of pending cases | claim 4 4