Commitments and Contingencies (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Rental expense for operating leases	$ 8,405	$ 7,996
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability, Current	290	$ 250
Maximum [Member]
Loss Contingencies [Line Items]
Minimum Annual Guarantee Rent Payment	320
Minimum [Member]
Loss Contingencies [Line Items]
Minimum Annual Guarantee Rent Payment	$ 3
NEW YORK
Loss Contingencies [Line Items]
Lease Expiration Date	Oct. 31, 2019