Annual report pursuant to Section 13 and 15(d)

Leases - Narrative (Details)

v3.19.3.a.u2
Leases - Narrative (Details) - USD ($)
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating lease assets $ 14,168,000   $ 0
Accumulated deficit $ (2,847,726,000)   $ (845,368,000)
Weighted average remaining lease term 1 year 9 months    
Weighted-average discount rate - operating lease 3.52%    
Minimum      
Lessee, Lease, Description [Line Items]      
Lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lease term 5 years    
Drilling Rig | Minimum      
Lessee, Lease, Description [Line Items]      
Lease term 1 year    
Drilling Rig | Maximum      
Lessee, Lease, Description [Line Items]      
Lease term 2 years    
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Operating lease assets   $ 110,000,000  
Accumulated deficit   $ 0