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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2017 | Jan. 01, 2017
Revolving Credit Facility [Line Items] |  |  |
Total |  | $ 118,756 | $ 137,629
Bank of America, N.A. and Wells Fargo Capital Finance, LLC |  |  |
Revolving Credit Facility [Line Items] |  |  |
Total |  | $ 95,900 | $ 112,507
Revolving credit facility, interest rate description | one-month |  |
Revolving credit facility, interest rate at period end |  | 3.13% |
Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving Credit Facility, maximum borrowing capacity | $ 300,000 |  |
Revolving credit facility, current borrowing capacity |  | $ 221,545 |
Total |  | 95,900 |
Revolving credit facility, amount outstanding |  | 8,264 |
Revolving credit facility,, utilization threshold | 25.00% |  |
Percent of Eligible Billed Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable | 90.00% |  |
Percent of Eligible Unbilled Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable | 85.00% |  |
Percent of Eligible Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable | 15.00% |  |
Liquidation Value of Tacoma Headquarters Office Building | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility borrowing limits, liquidation value requirement, pledged real estate | $ 17,400 |  |
Revolving credit facility borrowing limits, quarterly reduction, liquidation value of pledged real estate | $ 400 |  |
Revolving credit facility borrowing limits, liquidation value of pledged real estate |  | 11,770 |
Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, remaining borrowing capacity |  | 117,381 |
Revolving credit facility, cash and cash equivalents under control agreements |  | 18,974 |
Revolving credit facility, total liquidity |  | $ 136,355 |
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, additional base rate | 1.00% | 1.75% |
Letters of credit, additional basis rate | 0.125% |  |
Base rate | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, additional base rate | 0.50% | 1.375% |
Minimum | Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, liquidity requirement | $ 37,500 |  |
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 1.25% |  |
Minimum | Base rate | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 0.25% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 2.00% |  |
Maximum | Base rate | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 1.00% |  |
Less than 25% utilization | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, unused capacity, commitment fee percentage | 0.375% |  |
Greater than or equal to 25% utilization | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, unused capacity, commitment fee percentage | 0.25% |  |

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- Definition The Base Rate is the greater of the prime rate (as announced by Bank of America), the federal funds rate plus an additional rate or the 30 day LIBOR rate plus an additional rate. + References No definition available. + Details
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- Definition Current liquidation value of the pledged real estate as of the reporting date for the purpose of computing the revolving credit facility borrowing limit. This is the maximum liquidation value of the pledged real estate less the quarterly reduction. This borrowing limit is in addition to the borrowing limit as a percentage of eligible accounts receivable. + References No definition available. + Details
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- Definition Revolving credit facility borrowing limit as a percentage of eligible accounts receivable. This borrowing limit is in addition to the current liquidation value of the pledged real estate as of the reporting date for the purpose of computing the revolving credit facility borrowing limit. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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