Annual report pursuant to Section 13 and 15(d)

Income Taxes - Deferred Income Tax Assets and Liabilities (Details)

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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Allowance for doubtful accounts $ 1,189 $ 1,180
Lease asset 11,105  
Deferred compensation 0 1,032
Accrued liabilities 950 3,428
Net operating loss carryover 4,180 467
Foreign tax credits 76,060 51,776
Other 1,633 1,627
Valuation allowance 63,783 51,776
Deferred tax assets 31,334 7,734
Deferred tax liabilities:    
Property and equipment (55,180) (63,181)
Intangible assets 0 (4,936)
Withholding taxes 0 (17,419)
Lease liability (11,151)  
Other (1,876) (1,507)
Deferred tax liabilities (68,207) (87,043)
Net deferred tax liability (36,873) (79,309)
Reflected in accompanying balance sheet as:    
Deferred income tax asset 0 0
Deferred income tax liability (36,873) (79,309)
Changes in valuation allowance $ 12,000 36,300
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforwards   76,100
Federal Tax Authority    
Operating Loss Carryforwards [Line Items]    
Tax credit carryforwards   $ 17,800