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INCOME TAXES: Carry forwards (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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) | 1.10% | 1.00% | 1.00%
Exempt municipal bond interest (as a percent) | (0.10%) | (0.50%) | (0.40%)
Foreign tax rates (as a percent) | (1.30%) | (1.50%) | (2.00%)
Qualified domestic production activities deduction (as a percent) | (2.60%) | (2.80%) | (2.20%)
Tax credits receivable (as a percent) | (1.20%) | (0.60%) | (0.90%)
Adjustment of deferred tax balances (as a percent) | 0.20% | 1.90% | (1.10%)
Reserve for uncertain tax benefits (as a percent) | (2.10%) |  | (0.70%)
Other, net (as a percent) | (0.40%) | (1.40%) | (0.70%)
Effective income tax rate (as a percent) | 28.60% | 31.10% | 28.00%
Foreign subsidiaries' undistributed earnings | $ 3,529 | $ 5,393 |
Estimated federal income tax liability on foreign subsidiaries' undistributed earnings (as a percent) | 30.00% |  |
Cash and short term investments held by foreign subsidiary | $ 15,265 | 15,986 |
Portion of unrecognized tax benefits that, if recognized, would favorably affect annual effective income tax rate | 2,737 | 4,805 |
Interest and penalties included in liability for uncertain tax positions | 421 | 1,591 |
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Unrecognized tax benefits at the beginning of the period | 6,993 | 6,010 | $ 6,677
Increases in tax positions for the current year | 812 | 1,827 | 1,163
Increases in tax positions for new uncertain tax position |  | 609 |
Reductions in tax positions for lapse of statute of limitations | (865) | (1,050) | (867)
Reductions in tax positions relating to settlements with taxing authorities | (772) | (403) | (140)
Decreases in prior period unrecognized tax benefits | (1,488) |  |
Reductions in tax positions for effective settlements |  |  | (823)
Unrecognized tax benefits at the end of the period | 4,680 | $ 6,993 | $ 6,010
Canada |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 4,081 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 | 3,439 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 602 |  |
Spain |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2026 | 273 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2027 | 58 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2028 | 200 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2029 | 99 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2030 | 306 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2031 | 399 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2032 | 288 |  |
Tax benefits of foreign subsidiary tax loss carry forwards expiring in 2033 | $ 211 |  |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_ES
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Data Type: | na
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