Fair Value of Financial Instruments Financial instruments Carried at Fair Value-Level 3 (Details) - Jun. 30, 2015 £ in Thousands, $ in Thousands	GBP (£)	USD ($)
Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities carried at fair value, Accrued deferred consideration	£ 23,957	$ 37,673