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Income Taxes - Narrative (Details) € in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2016 USD ($)
Tax carryforwards |  |  |  |  |
Transition tax |  |  | $ 160,000,000 |  |
REIT taxable income |  |  | 70,900,000 |  |
GILTI estimate | $ 0 | $ 41,944,000 |  |  |
Net operating loss carryforwards, tax effected | 99,240,000 | 92,952,000 |  |  |
Benefit for income taxes | $ (59,931,000) | $ (42,753,000) | $ (22,962,000) |  |
Federal tax rate | 21.00% | 21.00% | 35.00% |  |
Effective tax rate | 18.30% | 10.40% | 11.40% |  |
Tax adjustment relating to REIT | $ 40,577,000 | $ 35,165,000 | $ 78,873,000 |  |
Foreign tax rate differential provision (benefit) | 8,562,000 | 1,031,000 | (9,639,000) |  |
Tax benefit as a result of the resolution of a tax matter |  | 14,000,000 |  |  |
Increase in valuation allowance (net operating losses) | (6,211,000) | (3,568,000) | 4,317,000 |  |
Tax expense |  |  | 24,791,000 |  |
Incremental foreign earnings | 279,700,000 |  |  |  |
Increase in gross interest and penalties recorded | 1,780,000 | 1,961,000 | 289,000 |  |
Accrued interest and penalties recorded | 9,282,000 | 7,557,000 |  |  |
Unrecognized tax benefits | 35,068,000 | 35,320,000 | $ 38,533,000 |  | $ 59,466,000
Unrecognized tax benefits included in other long-term liabilities | 31,992,000 | 32,144,000 |  |  |
Deferred income taxes including unrecognized tax benefits | 3,076,000 | 3,176,000 |  |  |
Unrecognized tax benefits net of federal benefits | 32,311,000 |  |  |  |
Unrecognized tax benefits that would impact tax rate | 7,400,000 |  |  |  |
Unrecognized tax benefits that would impact tax rate, net of federal tax benefit |  | 4,587,000 |  |  |
Foreign |  |  |  |  |
Tax carryforwards |  |  |  |  |
Net operating loss carryforwards, tax effected | $ 90,811,000 |  |  |  |
Net operating loss carryforwards subject to valuation allowance (as a percent) | 64.00% |  |  |  |
Tax and Customs Administration, Netherlands | Foreign |  |  |  |  |
Tax carryforwards |  |  |  |  |
VAT liability |  | $ 4,971,000 |  | € 16,800 |
Federal |  |  |  |  |
Tax carryforwards |  |  |  |  |
Net operating loss carryforwards, before tax effect | $ 152,743,000 |  |  |  |
Net operating loss carryforwards, tax effected | 39,156,000 |  |  |  |
Benefit for income taxes | $ 8,223,000 |  |  |  |

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