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Income Taxes, Tax Reconciliation and Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective tax rate reconciliation [Abstract] |  |  |  |  |  |
Taxes at statutory rate |  |  |  | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit |  |  |  | 2.20% | 2.20% | 1.10%
Tax credits |  |  |  | (1.50%) | (2.60%) | (1.50%)
Taxes on foreign earnings |  |  |  | 2.80% | 5.10% | (0.40%)
Global Intangible Low-Taxed Income |  |  |  | 0.10% | 0.90% | 0.60%
Foreign Derived Tangible Income |  |  |  | (1.10%) | (1.00%) | (0.60%)
Loss on balance sheet hedge |  |  |  | 2.00% | 0.00% | 0.00%
Resolution of prior years' tax matters |  |  |  | (0.10%) | (0.40%) | (0.30%)
Valuation allowance adjustments |  |  |  | (3.70%) | (8.80%) | 0.40%
2017 Tax Legislation |  |  |  | 0 | 0 | (0.037)
U.S. tax accounting method changes |  |  |  | 0.00% | 0.00% | (2.90%)
Other, net |  |  |  | (1.10%) | 2.40% | (0.40%)
Effective tax rate |  |  |  | 20.60% | 18.80% | 13.30%
Valuation Allowance [Abstract] |  |  |  |  |  |
Valuation allowance | [1] |  |  | $ (47,813) | $ (54,326) |
Increase in valuation allowance amount |  | $ 16,200 |  |  |  |
Increase in valuation allowance for deferred tax assets, related to operating losses |  |  |  |  | $ 6,800 |
2017 Tax Act [Abstract] |  |  |  |  |  |
Income tax expense |  |  | $ 18,400 |  |  | $ 11,800
Provisional income tax expense, change in amount |  |  |  |  |  | $ (6,600)
[1] | In the first quarter of 2019, the Company recognized an increase in its foreign tax credit carryover and corresponding valuation allowance of $16.2 million, related to the finalization of certain tax regulations.

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