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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%