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Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Expected income tax expense (benefit) at statutory rate                 $ (50,391) $ (72,225) $ (45,451)
Differences between expected and actual income tax expense:                      
U.S Tax Reform - Change in Federal rate                 62,758 0 0
U.S Tax Reform - Transition Tax                 34,846 0 0
Foreign tax differential including effectively connected income [1]                 (12,140) 42,463 41,695
Provision for (reversal of) liability for uncertain tax positions                 (16,925) 2,236 18,205
Provision for (reversal of) valuation allowance on deferred tax assets [2]                 (29,979) 15,639 97,069
Provision for liability for intra-entity transactions                 2,484 3,357 4,700
State tax, after Federal tax benefit                 (3,938) 250 (2,867)
Excess tax benefits from share-based compensation                 (3,701) 0 0
Other permanent differences                 2,783 515 (463)
Non-deductible regulatory settlements                 0 0 700
Other                 (1,313) 779 3,263
Total $ (51) $ (20,418) $ 2,828 $ 2,125 $ 228 $ (7,110) $ (9,180) $ 9,076 $ (15,516) $ (6,986) $ 116,851
[1] The foreign tax differential includes a benefit recognized in 2017 and 2016 for taxable losses earned by OMS which are taxable in the U.S. as effectively connected income (ECI). The foreign tax differential for 2015 included positive ECI expected to be generated for that year. The impact of ECI to income tax expense (benefit) for 2017, 2016 and 2015 was $(28.5) million, $(7.4) million and $7.3 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 and 2015 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 and 2015. Also included in the provision for valuation allowance in 2015 is the reversal of a portion of the valuation allowance previously recorded on taxable losses earned by OMS which were taxable in the U.S. as ECI, which is equal to the positive taxable income that is expected to be generated for ECI purposes for the year ended December 31, 2015.