Short-Term Investments	6 Months Ended
Jun. 30, 2013
Short-term Investments [Abstract]
Cash, Cash Equivalents, and Short-term Investments [Text Block]	Short-Term Investments The company's short-term investments include certificates of deposit and fixed deposits whose original maturity is greater than three months and is one year or less. Certificates of deposit and fixed deposits whose original maturity is three months or less are classified as cash equivalents and certificates of deposit and fixed deposits whose maturity is greater than one year at the balance sheet date are classified as non-current assets in our condensed consolidated balance sheet. The purchase of any certificate of deposit or fixed deposit that is classified as a short-term investment or non-current asset appears in the investing section of our condensed consolidated statement of cash flows. Included in cash and cash equivalents are money market funds of $18.5 million and $28.5 million at June 30, 2013 and December 30, 2012, respectively. Our money market funds are categorized as Level 1 in the fair value hierarchy with fair value measurements based on quoted prices in active markets for identical assets. Restricted Deposits We purchase certificates of deposit with maturity dates that expire within twelve months that are used to directly secure or collateralize letters of credit securing our workers’ compensation obligations. At June 30, 2013 and December 30, 2012, certificates of deposit totaling $4.0 million were restricted in use and were classified as short-term investments on our condensed consolidated balance sheets.

Short-Term Investments

The company's short-term investments include certificates of deposit and fixed deposits whose original maturity is greater than three months and is one year or less. Certificates of deposit and fixed deposits whose original maturity is three months or less are classified as cash equivalents and certificates of deposit and fixed deposits whose maturity is greater than one year at the balance sheet date are classified as non-current assets in our condensed consolidated balance sheet. The purchase of any certificate of deposit or fixed deposit that is classified as a short-term investment or non-current asset appears in the investing section of our condensed consolidated statement of cash flows. Included in cash and cash equivalents are money market funds of $18.5 million and $28.5 million at June 30, 2013 and December 30, 2012, respectively. Our money market funds are categorized as Level 1 in the fair value hierarchy with fair value measurements based on quoted prices in active markets for identical assets.

Restricted Deposits

We purchase certificates of deposit with maturity dates that expire within twelve months that are used to directly secure or collateralize letters of credit securing our workers’ compensation obligations. At June 30, 2013 and December 30, 2012, certificates of deposit totaling $4.0 million were restricted in use and were classified as short-term investments on our condensed consolidated balance sheets.