Revolving Credit Facilities	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Revolving Credit Facilities	Revolving Credit Facilities The Company entered into a Credit Agreement, dated as of August 2, 2010, subsequently amended most recently as of September 28, 2018, among the Company, the lenders party thereto and Bank of America, N.A., as Administrative Agent (the “Credit Agreement”). The Credit Agreement includes a revolving commitment amount of $175 million and $160 million in the aggregate through September 25, 2019 and September 25, 2020, respectively. The Credit Agreement also provides the Company the right to increase the aggregate commitment amount by an additional $50 million. Outstanding borrowings under the revolving credit facility are guaranteed by the Company’s material domestic subsidiaries, as defined in the Credit Agreement. The most recent amendment (i) extends the maturity date from September 25, 2019 to September 25, 2020, (ii) adjusts the applicable rate spreads charged for interest on outstanding loans and letters of credit, and (iii) increases the maximum leverage ratio to which the Company is subject for the trailing twelve months ended September 30, 2018 and for the trailing twelve months ending December 31, 2018. The Company’s obligations under the Credit Agreement and such domestic subsidiaries’ guaranty obligations are secured by substantially all of their respective assets. The ranges of applicable rates charged for interest on outstanding loans and letters of credit are 50-225 basis point spread for loans based on the base rate and 150-325 basis point spread for letter of credit fees and loans based on the Eurodollar rate. The terms of the Credit Agreement include various covenants, including covenants that require the Company to maintain a maximum leverage ratio and a minimum interest coverage ratio. The most recent amendment to the Credit Agreement modified the maximum leverage ratio from 3.00 to 1.0 to 4.25 to 1.0 for the trailing twelve months ended September 30, 2018, and from 3.00 to 1.0 to 3.50 to 1.0 for the trailing twelve months ending December 31, 2018. The maximum leverage ratio is 3.00 to 1.0 for the trailing twelve months ending March 31, 2019 and each period thereafter. The Company is also required to maintain an interest coverage ratio of no less than 5.0 to 1.0. The Company is in compliance with all debt covenants as of September 30, 2018. At September 30, 2018, the Company had $3.6 million of unused availability under the Credit Agreement and $0.5 million of letters of credit which have not been drawn upon. The outstanding revolving credit facility - noncurrent was $138.4 million and $128.4 million as of September 30, 2018 and December 31, 2017, respectively, and the revolving credit facility - current was $13.0 million and $0.0 million as of September 30, 2018 and December 31, 2017, respectively. On February 22, 2016, the Company entered into a Revolving Credit Facility (the “Facility”) with Bank of America N.A. to support ongoing working capital needs of the Company's operations in China. The Facility includes a revolving commitment amount of $5.0 million whereby maturity dates vary based on each individual drawdown. Outstanding borrowings under the Facility are guaranteed by the Company’s assets. Borrowings and repayments are made in renminbi, the official Chinese currency. The applicable interest rate is 110% of the People’s Bank of China’s base rate. The terms of the Facility include limitations on use of funds for working capital purposes as well as customary representations and warranties made by the Company. At September 30, 2018, the Company had $4.5 million of unused availability under the Facility.

Revolving Credit Facilities

The Company entered into a Credit Agreement, dated as of August 2, 2010, subsequently amended most recently as of September 28, 2018, among the Company, the lenders party thereto and Bank of America, N.A., as Administrative Agent (the “Credit Agreement”). The Credit Agreement includes a revolving commitment amount of $175 million and $160 million in the aggregate through September 25, 2019 and September 25, 2020, respectively. The Credit Agreement also provides the Company the right to increase the aggregate commitment amount by an additional $50 million. Outstanding borrowings under the revolving credit facility are guaranteed by the Company’s material domestic subsidiaries, as defined in the Credit Agreement.

The most recent amendment (i) extends the maturity date from September 25, 2019 to September 25, 2020, (ii) adjusts the applicable rate spreads charged for interest on outstanding loans and letters of credit, and (iii) increases the maximum leverage ratio to which the Company is subject for the trailing twelve months ended September 30, 2018 and for the trailing twelve months ending December 31, 2018.

The Company’s obligations under the Credit Agreement and such domestic subsidiaries’ guaranty obligations are secured by substantially all of their respective assets. The ranges of applicable rates charged for interest on outstanding loans and letters of credit are 50-225 basis point spread for loans based on the base rate and 150-325 basis point spread for letter of credit fees and loans based on the Eurodollar rate.

The terms of the Credit Agreement include various covenants, including covenants that require the Company to maintain a maximum leverage ratio and a minimum interest coverage ratio. The most recent amendment to the Credit Agreement modified the maximum leverage ratio from 3.00 to 1.0 to 4.25 to 1.0 for the trailing twelve months ended September 30, 2018, and from 3.00 to 1.0 to 3.50 to 1.0 for the trailing twelve months ending December 31, 2018. The maximum leverage ratio is 3.00 to 1.0 for the trailing twelve months ending March 31, 2019 and each period thereafter. The Company is also required to maintain an interest coverage ratio of no less than 5.0 to 1.0. The Company is in compliance with all debt covenants as of September 30, 2018.

At September 30, 2018, the Company had $3.6 million of unused availability under the Credit Agreement and $0.5 million of letters of credit which have not been drawn upon. The outstanding revolving credit facility - noncurrent was $138.4 million and $128.4 million as of September 30, 2018 and December 31, 2017, respectively, and the revolving credit facility - current was $13.0 million and $0.0 million as of September 30, 2018 and December 31, 2017, respectively.

On February 22, 2016, the Company entered into a Revolving Credit Facility (the “Facility”) with Bank of America N.A. to support ongoing working capital needs of the Company's operations in China. The Facility includes a revolving commitment amount of $5.0 million whereby maturity dates vary based on each individual drawdown. Outstanding borrowings under the Facility are guaranteed by the Company’s assets. Borrowings and repayments are made in renminbi, the official Chinese currency. The applicable interest rate is 110% of the People’s Bank of China’s base rate. The terms of the Facility include limitations on use of funds for working capital purposes as well as customary representations and warranties made by the Company. At September 30, 2018, the Company had $4.5 million of unused availability under the Facility.