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Income Taxes - Statutory Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes |  |  |
Statutory tax rate percentage | 35.00% | 34.00% | 34.00%
Reconciliation of statutory tax and provision |  |  |
Expected tax at statutory rate | $ 2,933 | $ 3,884 | $ 17,305
Foreign taxes at other rates | (3,139) | (7,512) | (12,487)
US tax on foreign earnings, net of foreign tax credits | (226) | (405) | 1,968
Valuation reserves on NOL carryforwards | 3,997 | 3,816 | 469
US tax reform - deemed repatriation | 18,472 |  |
US tax reform - changes in indefinite reinvestment assertion | 7,281 |  |
US tax reform - deferred tax expense from tax rate change | 2,339 |  |
State income taxes, net of federal benefit | (59) | 83 | 26
Disallowed expenses and other | (818) | 997 | 1,423
Total | $ 30,780 | $ 863 | $ 8,704

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