Due To and From Factor (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments Related to Tax Withholding for Share-based Compensation		$ 14,629
Line of Credit Facility, Collateral		.85
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000	$ 30,000
Letters Of Credit SubLimit Capacity Amount		$ 15,000
Factoring Fee		0.20%
Debt Instrument, Basis Spread on Variable Rate	0.50%
Private Label [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Factoring Fee		0.14%
London Interbank Offered Rate (LIBOR) [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%