Fair Value of Financial Instruments Financial instruments Carried at Fair Value-Level 3 (Details) (Liability [Member], Fair Value, Inputs, Level 3 [Member]) In Thousands, unless otherwise specified	Mar. 31, 2015 USD ($)	Mar. 31, 2015 GBP (£)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accrued deferred consideration	$ 35,563	£ 23,957