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Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	$ 279,755,000	$ 286,880,000
Adjusted beginning balance		286,880,000
Other comprehensive income (loss), net of tax	599,000	(715,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Ending balance	274,829,000	281,419,000
ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment			$ 0	$ 0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	(6,887,000)	(5,428,000)
Adjusted beginning balance	(6,887,000)	(6,174,000)
Ending balance	(6,288,000)	(6,889,000)
AOCI Attributable to Parent [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment				(746,000)
Unrealized Gain on Short-Term Investments [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	0	746,000
Adjusted beginning balance	0	0
Other comprehensive income (loss), net of tax	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Ending balance	0	0
Unrealized Gain on Short-Term Investments [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment			0	(746,000)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	(6,887,000)	(6,174,000)
Adjusted beginning balance	(6,887,000)	(6,174,000)
Other comprehensive income (loss), net of tax	599,000	(715,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Ending balance	$ (6,288,000)	$ (6,889,000)
Foreign Currency Translation [Member] | ASU 2016-01 [Member]
Accumulated Other Comprehensive Income [Abstract]
Cumulative-effect adjustment			$ 0	$ 0

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