Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Narrative) (Details)

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Acquisitions (Narrative) (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 2 Months Ended 3 Months Ended
Feb. 17, 2017
USD ($)
a
$ / shares
shares
Mar. 31, 2017
USD ($)
Feb. 16, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 15, 2016
$ / shares
Business Acquisition [Line Items]            
Acquisition costs       $ 0 $ 1,298,000  
Common stock share price (in usd per share) | $ / shares $ 19.48         $ 20.96
Revenue   $ 26,200,000        
Vitruvian acquisition            
Business Acquisition [Line Items]            
Net surface area (in acre) | a 46,400          
Total initial purchase price $ 1,850,000,000          
Payments to acquire businesses $ 1,354,093,000          
Equity interest issued or issuable, number of shares (in shares) | shares 23.9          
Acquisition costs       $ 0 $ 1,300,000  
Goodwill $ 0          
Bargain purchase gain $ 0          
Initial purchase share price (in usd per share) | $ / shares           $ 20.96
Decrease in fair value of shares issued for acquisition, amount     $ 35,300,000      
Vitruvian acquisition | Indemnity escrow            
Business Acquisition [Line Items]            
Equity interest issued or issuable, number of shares (in shares) | shares 5.2