Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Business Outlook (Details)

v3.10.0.1
Organization and Summary of Significant Accounting Policies - Business Outlook (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 26, 2018
Texas South Yard        
Long Lived Assets Held-for-sale [Line Items]        
Sale of PP&E   $ 55.0    
Cost of PP&E sales   $ 1.5    
Proceeds from sale of PP&E     $ 53.5  
Gain on sale of assets     3.9  
Texas North Yard        
Long Lived Assets Held-for-sale [Line Items]        
Sale of PP&E $ 1.1   $ 1.1 $ 28.0
Proceeds from deposits on real estate sales $ 0.5