Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
LIABILITIES
Contingent consideration related to acquisitions	$ 15,000
Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	27,176	$ 118,993
Restricted cash	5,320	2,419
Marketable securities	9,297	11,592
Total	41,793	133,004
LIABILITIES
Contingent consideration related to acquisitions	23,843	16,155
Total	23,843	16,155
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	27,176	118,993
Restricted cash	5,320	2,419
Marketable securities	9,297	11,592
Total	41,793	133,004
LIABILITIES
Contingent consideration related to acquisitions	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	0	0
Restricted cash	0	0
Marketable securities	0	0
Total	0	0
LIABILITIES
Contingent consideration related to acquisitions	0	0
Total	0	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
ASSETS
Cash and cash equivalents	0	0
Restricted cash	0	0
Marketable securities	0	0
Total	0	0
LIABILITIES
Contingent consideration related to acquisitions	23,843	16,155
Total	$ 23,843	$ 16,155