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Income Taxes - Other (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Current: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  |  | $ 887 | $ 8,756 | $ 4,651
State |  |  |  |  |  |  |  |  |  |  | 774 | 3,153 | 1,152
Foreign |  |  |  |  |  |  |  |  |  |  | 1,444 | 552 | 2,761
Total current |  |  |  |  |  |  |  |  |  |  | 3,105 | 12,461 | 8,564
Deferred: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  |  | (4,769) | (6,505) | (1,648)
State |  |  |  |  |  |  |  |  |  |  | 754 | (560) | (97)
Foreign |  |  |  |  |  |  |  |  |  |  |  |  | (2,073)
Total deferred |  |  |  |  |  |  |  |  |  |  | (4,015) | (7,065) | (3,818)
Total income tax (benefit) expense |  | $ 959 | $ 6,935 | $ 564 | $ (9,368) | $ 1,876 | $ 4,522 | $ 7,688 | $ (8,690) |  | $ (910) | $ 5,396 | $ 4,746
Reconciliation to income tax at the statutory rate: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal tax at statutory rates (as a percent) | 35.00% |  |  |  |  |  |  |  |  | 21.00% | 28.00% | 35.00% | 35.00%
Permanent items (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.90% | 7.10% | 4.80%
Lobbying (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.20% | 7.20% | 5.30%
State taxes, net of federal benefit (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.10% | 19.50% | 3.80%
Research and development tax credits (as a percent) |  |  |  |  |  |  |  |  |  |  |  | (8.20%) | (8.10%)
Domestic production activities deduction (as a percent) |  |  |  |  |  |  |  |  |  |  | (0.10%) | (22.90%) | (5.20%)
Change in valuation allowance (as a percent) |  |  |  |  |  |  |  |  |  |  | (7.20%) | 53.30% | 2.90%
Effects of foreign operations (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.60% | (0.90%)
Reserve for unrecognized tax benefits (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.90% | 3.30% | (6.30%)
Noncontrolling Interests (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.40% | 12.50% | 4.20%
Other (as a percent) |  |  |  |  |  |  |  |  |  |  | (3.90%) | (0.10%) | 0.20%
Impact of federal tax rate reduction |  |  |  |  |  |  |  |  |  |  | (25.40%) |  |
Repatriation transition tax |  |  |  |  |  |  |  |  |  |  | 6.40% |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  | (7.70%) |  |
(Benefit) provision for income taxes |  |  |  |  |  |  |  |  |  |  | (3.40%) | 109.30% | 35.70%
Blended federal tax rate |  |  |  |  |  |  |  |  |  |  | 28.00% |  |

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