Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
ASSETS
Cash and cash equivalents	$ 103,145	$ 105,999
Restricted cash	4,351	5,488
Marketable securities	10,656	12,012
Total	118,152	123,499
LIABILITIES
Contingent consideration related to acquisitions	14,913	5,336
Total	14,913	5,336
Quoted Prices in Active Markets for Identical Assets (Level 1)
ASSETS
Cash and cash equivalents	103,145	105,999
Restricted cash	4,351	5,488
Marketable securities	10,656	12,012
Total	118,152	123,499
LIABILITIES
Contingent consideration related to acquisitions	0	0
Total	0	0
Significant Other Observable Inputs (Level 2)
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)
ASSETS
Cash and cash equivalents	0	0
Restricted cash	0	0
Marketable securities	0	0
Total	0	0
LIABILITIES
Contingent consideration related to acquisitions	14,913	5,336
Total	$ 14,913	$ 5,336