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INCOME TAXES - Income tax rates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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) | 1.00% | 1.10% | 1.00%
Exempt municipal bond interest (as a percent) | (0.10%) | (0.10%) | (0.50%)
Foreign tax rates (as a percent) | (0.40%) | (1.30%) | (1.50%)
Qualified domestic production activities deduction (as a percent) | (2.70%) | (2.60%) | (2.80%)
Tax credits receivable (as a percent) | (0.50%) | (1.20%) | (0.60%)
Adjustment of deferred tax balances (as a percent) | (0.50%) | 0.20% | 1.90%
Reserve for uncertain tax benefits (as a percent) |  | (2.10%) |
Other, net (as a percent) | (0.60%) | (0.40%) | (1.40%)
Effective income tax rate (as a percent) | 31.20% | 28.60% | 31.10%
Foreign subsidiaries' undistributed earnings | $ 22,081 | $ 20,174 |
Estimated federal income tax liability on foreign subsidiaries' undistributed earnings (as a percent) | 30.00% |  |
Cash and short term investments held by foreign subsidiary | $ 12,354 | 15,265 |
Portion of unrecognized tax benefits that, if recognized, would favorably affect annual effective income tax rate | 2,761 | 2,737 |
Interest and penalties included in liability for uncertain tax positions | 439 | 421 |
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Unrecognized tax benefits at the beginning of the period | 4,680 | 6,993 | $ 6,010
Increases in tax positions for the current year | 803 | 812 | 1,827
Increases in tax positions for new uncertain tax position |  |  | 609
Reductions in tax positions for lapse of statute of limitations | (718) | (865) | (1,050)
Reductions in tax positions relating to settlements with taxing authorities | (27) | (772) | (403)
Increases in prior period unrecognized tax benefits | 8 |  |
Decreases in prior period unrecognized tax benefits |  | (1,488) |
Unrecognized tax benefits at the end of the period | 4,746 | $ 4,680 | $ 6,993
Canada |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 2,181 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 | 3,546 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 619 |  |
Spain |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2026 | 264 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2027 | 56 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 168 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 | 96 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2030 | 290 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 387 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2032 | 291 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2033 | 117 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2034 | $ 437 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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