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DEBT (Details - Revolving Credit Facility) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 21, 2017 USD ($) | Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) Rate | Oct. 26, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Current Maturities |  | $ 115,000,000 |  | $ 125,000,000 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | Rate |  | 3.91% |  | 4.02% |
Ratio of Debt to EBITDA Step-Down | 4.0 |  |  |  |
Ratio of Debt to EBITDA Increase | 0.5 |  |  |  |
Interest Expense, Debt |  | $ 7,500,000 | $ 7,200,000 |  |
Debt Instrument, Unused Borrowing Capacity, Fee |  | 300,000 | 400,000 |  |
Amortization of debt issuance costs |  | 970,000 | 865,000 |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Current borrowing capacity | $ 250,000,000.0 |  |  |  | $ 350,000,000.0
Revolving Credit Facility, term | 5 years |  |  |  |
Revolving Credit Facility, conditional increase to borrowing capacity | $ 100,000,000.0 |  |  |  |
Increase in borrowing capacity |  |  |  |  | $ 100,000,000.0
Revolving Credit Facility, collateral, percent of assets | 100.00% |  |  |  |
Revolving Credit Facility, collateral, percent of equity | 100.00% |  |  |  |
Revolving Credit Facility, letter of credit fronting fee percentage | 0.125% |  |  |  |
Fees and expense paid to lenders at closing | $ 500,000 |  |  |  |
Line of Credit Facility, Collateral, Percent of Domestic Subsidiaries Equity | 100.00% |  |  |  |
Line of Credit Facility, Collateral, Percent of Voting Equity | 66.00% |  |  |  |
Line of Credit Facility, Collateral, Percent of Non-Voting Equity | 100.00% |  |  |  |
Swingline Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Current borrowing capacity | $ 10,000,000.0 |  |  |  |
Letters of Credit [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Current borrowing capacity | $ 10,000,000.0 |  |  |  |
Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 0.50% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 1.00% |  |  |  |
Minimum | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, unused capacity, commitment fee percentage | 0.25% |  |  |  |
Revolving Credit Facility, letter of credit participation fee percentage | 1.25% |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 1.25% |  |  |  |
Minimum | Base Rate [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 0.25% |  |  |  |
Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Ratio of Debt to EBITDA to Increase Revolving Commitment | 2.50 |  |  |  |
Ratio of Debt to EBITDA | 4.5 |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, unused capacity, commitment fee percentage | 0.45% |  |  |  |
Revolving Credit Facility, letter of credit participation fee percentage | 2.00% |  |  |  |
Maximum | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 2.00% |  |  |  |
Maximum | Base Rate [Member] | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving Credit Facility, basis spread on variable rate | 1.00% |  |  |  |
Revolving Credit Facility, Borrowings At Base Rate Plus LIBOR [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest Expense, Debt |  | 3,200,000 |  |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest Expense, Debt |  | 3,800,000 |  |  |
Amortization of debt issuance costs |  | 300,000 | $ 200,000 |  |
Revolving Credit Facility, 31 Day Borrowing | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Current Maturities |  | 65,000,000.0 |  |  |
Revolving Credit Facility, 32 Day Borrowing | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Current Maturities |  | $ 50,000,000.0 |  |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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