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INCOME TAXES - Income tax rates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective income tax rate differs from the statutory rate |  |  |
U.S. statutory rate (as a percent) | 35.00% | 35.00% | 35.00%
State income taxes, net (as a percent) | 1.60% | 1.00% | 1.10%
Exempt municipal bond interest (as a percent) | (0.10%) | (0.10%) | (0.10%)
Foreign tax rates (as a percent) | 0.50% | (0.40%) | (1.30%)
Qualified domestic production activities deduction (as a percent) | (0.80%) | (2.70%) | (2.60%)
Tax credits receivable (as a percent) | (1.40%) | (0.50%) | (1.20%)
Adjustment of deferred tax balances (as a percent) | (24.20%) | (0.50%) | 0.20%
Reserve for uncertain tax benefits (as a percent) | (0.30%) |  | (2.10%)
Worthless stock deduction (as a percent) | (3.80%) |  |
Other, net (as a percent) | (1.90%) | (0.60%) | (0.40%)
Effective income tax rate (as a percent) | 4.60% | 31.20% | 28.60%
Dividends received deduction for certain qualified dividends foreign subsidiaries (as a percent) | 100.00% |  |
Portion of unrecognized tax benefits that, if recognized, would favorably affect annual effective income tax rate | $ 2,475 | $ 2,761 |
Interest and penalties included in liability for uncertain tax positions | 475 | 439 |
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Unrecognized tax benefits at the beginning of the period | 4,746 | 4,680 | $ 6,993
Increases in tax positions for the current year | 394 | 803 | 812
Reductions in tax positions for lapse of statute of limitations | (793) | (718) | (865)
Reductions in tax positions relating to settlements with taxing authorities |  | (27) | (772)
Increases in prior period unrecognized tax benefits |  | 8 |
Decreases in prior period unrecognized tax benefits | (5) |  | (1,488)
Unrecognized tax benefits at the end of the period | 4,342 | $ 4,746 | $ 4,680
Canada |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 3,075 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 665 |  |
Spain |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2026 | 301 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2027 | 64 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 192 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 | 109 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2030 | 331 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 441 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2032 | 332 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2033 | 134 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2034 | 464 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2035 | 670 |  |
Mexico |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2036 | $ 492 |  |

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