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Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Expected income tax expense (benefit) at statutory rate                 $ (15,010) $ (50,391) $ (72,225)
Differences between expected and actual income tax expense (2):                      
Bargain purchase gain disallowance                 (13,448) 0 0
Reduction in tax attributes for Section 382 & 383 limitations                 55,668 0 0
U.S. Tax Reform - Change in Federal rate                 (10,666) 62,758 0
U.S. Tax Reform - Transition Tax                 14,412 34,846 0
U.S. Tax Reform - BEAT Tax                 1,076 0 0
Foreign tax differential including effectively connected income [1]                 22,990 (12,140) 39,249
Provision for (reversal of) liability for uncertain tax positions                 (3,987) (16,925) 2,236
Provision for (reversal of) valuation allowance on deferred tax assets [2]                 (23,347) (29,979) 15,639
Provision for liability for intra-entity transactions                 0 2,484 3,357
State tax, after Federal tax benefit                 675 (3,938) 250
Excess tax benefits from share-based compensation                 (356) (3,701) 0
Other permanent differences                 122 (267) (138)
Foreign tax credit (generation) utilization                 (25,601) 0 3,214
Executive compensation disallowance                 959 221 425
Subpart F income                 3,222 2,824 228
Other provision to return differences                 (6,559) 221 (1,334)
Other                 379 (1,529) 2,113
Total $ (4,012) $ 845 $ 1,348 $ 2,348 $ (51) $ (20,418) $ 2,828 $ 2,125 $ 529 $ (15,516) $ (6,986)
[1] The foreign tax differential includes a benefit recognized in 2018, 2017 and 2016 for taxable losses earned by OMS which are taxable in the U.S. as effectively connected income (ECI). The impact of ECI to income tax benefit for 2018, 20176 and 2016 was $3.3 million, $28.5 million and $7.4 million, respectively.
[2] The benefit recorded for the provision for valuation allowance in 2017 relates primarily to the reduction in the valuation allowance necessary as a result of revaluing our deferred tax assets due to U.S. tax reform and the reduction in the corporate tax rate. This benefit is partially offset by an increase in valuation allowance necessary for current year losses. The provision for valuation allowance in 2016 primarily relates to the recording of the valuation allowance on both the U.S. and USVI net deferred tax assets as of December 31, 2016.