Debt	12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt At December 31, 2017 and 2016, the Company had no debt outstanding. The Company is party to a Credit Agreement (as amended, the “Credit Agreement”) with two banks, Bank of America, N.A., as administrative agent and letter of credit issuer, and Wells Fargo Bank, National Association as syndication agent. The Credit Agreement extends through October 1, 2021, and provides for maximum borrowings of $150.0 million. In the third quarter of 2016, the Company signed a Third Amendment to the Credit Agreement, which, along with other minor changes, eliminated the restriction of maximum borrowings based on the amount of eligible accounts receivable plus the amount of eligible finished goods and raw materials, less any reserves established by the banks. Additionally, at the Company's request and subject to certain conditions, the commitments under the Credit Agreement may be increased by a maximum of up to $100.0 million as long as existing or new lenders agree to provide such additional commitments. Borrowings under the line of credit bear interest, at the Company’s option, at either (1) LIBOR plus a margin that varies from 0.875% to 1.75% depending upon the Leverage Ratio (as defined in the Credit Agreement), or (2) the base rate (which is the highest of the federal funds rate plus 0.5%, the prime rate, or LIBOR plus 1.0%) plus 0% to 0.25% (depending upon the Leverage Ratio). A commitment fee ranging from 0.15% to 0.30% (depending upon the Leverage Ratio) is payable on the unused line of credit. At December 31, 2017, there were no borrowings outstanding under the Credit Agreement, and letters of credit outstanding in the amount of $1.3 million left $148.7 million of credit available under the Credit Agreement. Obligations under the Credit Agreement are the only contractual borrowing obligations or commercial borrowing commitments of the Company. Obligations under the Credit Agreement are unsecured and contain customary covenants and events of default. The Company was in compliance with the covenants as of December 31, 2017. The Company paid interest totaling $0.2 million, $0.2 million and $0.3 million in 2017, 2016 and 2015, respectively, none of which was capitalized.

Debt

At December 31, 2017 and 2016, the Company had no debt outstanding.

The Company is party to a Credit Agreement (as amended, the “Credit Agreement”) with two banks, Bank of America, N.A., as administrative agent and letter of credit issuer, and Wells Fargo Bank, National Association as syndication agent. The Credit Agreement extends through October 1, 2021, and provides for maximum borrowings of $150.0 million. In the third quarter of 2016, the Company signed a Third Amendment to the Credit Agreement, which, along with other minor changes, eliminated the restriction of maximum borrowings based on the amount of eligible accounts receivable plus the amount of eligible finished goods and raw materials, less any reserves established by the banks. Additionally, at the Company's request and subject to certain conditions, the commitments under the Credit Agreement may be increased by a maximum of up to $100.0 million as long as existing or new lenders agree to provide such additional commitments. Borrowings under the line of credit bear interest, at the Company’s option, at either (1) LIBOR plus a margin that varies from 0.875% to 1.75% depending upon the Leverage Ratio (as defined in the Credit Agreement), or (2) the base rate (which is the highest of the federal funds rate plus 0.5%, the prime rate, or LIBOR plus 1.0%) plus 0% to 0.25% (depending upon the Leverage Ratio). A commitment fee ranging from 0.15% to 0.30% (depending upon the Leverage Ratio) is payable on the unused line of credit. At December 31, 2017, there were no borrowings outstanding under the Credit Agreement, and letters of credit outstanding in the amount of $1.3 million left $148.7 million of credit available under the Credit Agreement. Obligations under the Credit Agreement are the only contractual borrowing obligations or commercial borrowing commitments of the Company. Obligations under the Credit Agreement are unsecured and contain customary covenants and events of default. The Company was in compliance with the covenants as of December 31, 2017.

The Company paid interest totaling $0.2 million, $0.2 million and $0.3 million in 2017, 2016 and 2015, respectively, none of which was capitalized.