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INCOME TAXES - Effective tax rate - (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Effective income tax rate differs from the statutory rate |  |  |  |  |
U.S. statutory rate (as a percent) | 21.00% | 21.00% | 35.00% |  |
State income taxes, net (as a percent) | 0.50% | 0.50% | 1.60% |  |
Exempt municipal bond interest (as a percent) | (0.10%) | (0.10%) | (0.10%) |  |
Foreign tax rates (as a percent) | 1.40% | 2.10% | 0.50% |  |
Qualified domestic production activities deduction (as a percent) |  |  | (0.80%) |  |
Tax credits receivable (as a percent) | 0.50% |  | (1.40%) |  |
Adjustment of deferred tax balances (as a percent) | 0.20% | 0.10% | (24.20%) |  |
Reserve for uncertain tax benefits (as a percent) | 0.40% | (1.00%) | (0.30%) |  |
Worthless stock deduction (as a percent) |  |  | (3.80%) |  |
Other, net (as a percent) | 0.20% | (0.20%) | (1.90%) |  |
Effective income tax rate (as a percent) | 24.10% | 22.40% | 4.60% |  |
Unrecognized tax benefits | $ 3,339 | $ 4,342 | $ 4,342 | $ 3,678 | $ 3,339
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit) |  |  | (20,318) |  |
Portion of unrecognized tax benefits that, if recognized, would favorably affect annual effective income tax rate |  |  |  | 2,012 | 1,765
Interest and penalties included in liability for uncertain tax positions |  |  |  | 562 | 477
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |  |  |
Unrecognized tax benefits at the beginning of the period | 3,339 | 4,342 | 4,746 |  |
Increases in tax positions for the current year | 1,164 | 448 | 394 |  |
Reductions in tax positions for lapse of statute of limitations | (576) | (751) | (793) |  |
Reductions in tax positions for settlements and payments | (249) |  |  |  |
Decreases in prior period unrecognized tax benefits |  | (700) | (5) |  |
Unrecognized tax benefits at the end of the period | $ 3,678 | $ 3,339 | $ 4,342 |  |
Canada |  |  |  |  |
Effective income tax rate differs from the statutory rate |  |  |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 |  |  |  | $ 617 |
Spain |  |  |  |  |
Effective income tax rate differs from the statutory rate |  |  |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2026 |  |  |  |  | 282
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2027 |  |  |  |  | 60
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 |  |  |  |  | 179
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 |  |  |  |  | 102
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2030 |  |  |  |  | 310
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 |  |  |  |  | 412
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2032 |  |  |  |  | 311
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2033 |  |  |  |  | 125
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2034 |  |  |  |  | 434
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2035 |  |  |  |  | 548
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2036 |  |  |  |  | 797
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2037 |  |  |  |  | $ 407

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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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