Concentration of Revenue and Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Concentration of Revenue and Assets
Consolidated revenue	$ 90,489	$ 76,217
Consolidated long-lived assets, net	84,933		87,939
North America
Concentration of Revenue and Assets
Consolidated revenue	67,266	59,782
Europe
Concentration of Revenue and Assets
Consolidated revenue	18,339	13,431
Consolidated long-lived assets, net	339		344
Rest of world
Concentration of Revenue and Assets
Consolidated revenue	4,884	3,004
United States
Concentration of Revenue and Assets
Consolidated long-lived assets, net	52,884		53,228
Asia
Concentration of Revenue and Assets
Consolidated long-lived assets, net	$ 31,710		$ 34,367