Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Jun. 30, 2015	Mar. 31, 2015
ASSETS
Cash and cash equivalents	[1]	$ 104,859	$ 118,993
Restricted cash and cash equivalents		3,765	2,419
Marketable securities	[2]	11,938	11,592
Total		120,562	133,004
LIABILITIES
Fair value of contingent consideration		16,552	16,155
Total		16,552	16,155
Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Cash and cash equivalents	[1]	104,859	118,993
Restricted cash and cash equivalents		3,765	2,419
Marketable securities	[2]	11,938	11,592
Total		120,562	133,004
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Significant Other Observable Inputs (Level 2)
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		0	0
Total		0	0
Unobservable Inputs (Level 3)
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Marketable securities	[2]	0	0
Total		0	0
LIABILITIES
Fair value of contingent consideration		16,552	16,155
Total		$ 16,552	$ 16,155

[1] Cash equivalents consist of money market funds.

[2] Marketable securities consist of money market instruments and fixed-income securities, including certificates of deposit, corporate bonds and notes, and municipal securities.