Accounts Payable and Other Accrued Expenses and Other Current Liabilities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Deferred consideration payable	$ 8,595				$ 11,524
Contingent consideration payable	0				11,695
Total other current liabilities	$ 8,595	$ 8,716	$ 12,121	$ 11,988	$ 23,219	$ 22,640	$ 36,096	$ 24,396