Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 2017

Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]

Schedule of fair value, assets and liabilities measured on recurring basis

Assets measured at fair value on a recurring basis at June 30, 2017 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	111,766	$	—	$	111,766
Deposit accounts	—		661,270		661,270
Short-term investments:
Marketable equity securities	1,739		—		1,739
Corporate bonds and debt	—		235,856		235,856
Government agency bonds	—		199,689		199,689
Municipal bonds - tax exempt	—		9,920		9,920
Municipal bonds - taxable			10,005		10,005
Long-term investments:
Corporate bonds and debt	—		76,630		76,630
Government agency bonds	—		343,829		343,829
Total assets measured at fair value	$	113,505	$	1,537,199	$	1,650,704

Assets measured at fair value on a recurring basis at March 31, 2017 are as follows (amounts in thousands):

	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash and cash equivalents:
Money market mutual funds	$	343,815	$	—	$	343,815
Deposit accounts	—		564,869		564,869
Short-term investments:
Marketable equity securities	1,586		—		1,586
Corporate bonds and debt	—		165,207		165,207
Government agency bonds	—		161,973		161,973
Municipal bonds - non-taxable	—		55,279		55,279
Municipal bonds - taxable			10,043		10,043
Long-term investments:
Corporate bonds and debt	—		42,565		42,565
Government agency bonds	—		64,892		64,892
Total assets measured at fair value	$	345,401	$	1,064,828	$	1,410,229