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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Balance at beginning of period | $ 275,718,000 |  |  |
Other comprehensive (loss) income, net of tax | (715,000) | $ 285,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 |  |
Balance at end of period | 270,738,000 |  |  |
ASU 2016-01 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Cumulative-effect adjustment |  |  | $ (746,000) | $ 0
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Balance at beginning of period | (5,428,000) | (7,441,000) |  |
Adjusted balance at beginning of period | (6,174,000) | (7,441,000) |  |
Balance at end of period | (6,889,000) | (7,156,000) |  |
Unrealized Gain on Short-Term Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Balance at beginning of period | 746,000 | 528,000 |  |
Adjusted balance at beginning of period | 0 | 528,000 |  |
Other comprehensive (loss) income, net of tax | 0 | 56,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 |  |
Balance at end of period | 0 | 584,000 |  |
Unrealized Gain on Short-Term Investments [Member] | ASU 2016-01 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Cumulative-effect adjustment |  |  | (746,000) | 0
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Balance at beginning of period | (6,174,000) | (7,969,000) |  |
Adjusted balance at beginning of period | (6,174,000) | (7,969,000) |  |
Other comprehensive (loss) income, net of tax | (715,000) | 229,000 |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 |  |
Balance at end of period | $ (6,889,000) | $ (7,740,000) |  |
Foreign Currency Translation [Member] | ASU 2016-01 [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Cumulative-effect adjustment |  |  | $ 0 | $ 0

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