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LONG-TERM DEBT - Narrative (Details) - USD ($) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 07, 2012 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Oct. 27, 2016 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance cost |  | $ 2,234,000 |  | $ 2,395,000 |  |
Write off of deferred debt issuance cost |  | 500,000 |  |  |  |
Payments of debt issuance costs |  | 900,000 |  |  |  |
7.750% Senior Notes (excluding unamortized discount) | Senior Unsecured Notes Due December 15, 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 200,000,000.0 |  |  |  |  |
Stated interest rate | 7.75% |  |  |  |  |
Proceeds from issuance of long-term debt | $ 191,900,000 |  |  |  |  |
Promissory notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payments on other long-term debt |  | 800,000 | $ 1,000,000 |  |  |
Senior secured revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing amount |  |  |  |  | $ 200,000,000.0 |
Increase in commitments due to accordion feature |  | $ 100,000,000.0 |  |  |  |
Commitment fee basis point |  | 0.50% |  |  |  |
Outstanding borrowings |  | $ 57,000,000 |  |  |  |
Letters of credit outstanding |  | $ 1,300,000 |  |  |  |
Debt issuance cost |  |  |  |  |  | $ 2,400,000
Senior secured revolving credit facility | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee basis point |  | 0.375% |  |  |  |
Senior secured revolving credit facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee basis point |  | 0.50% |  |  |  |
Senior secured revolving credit facility | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |  |
Senior secured revolving credit facility | Base Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 0.75% |  |  |  |
Senior secured revolving credit facility | Base Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.25% |  |  |  |
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% |  |  |  |
Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing amount |  | $ 50,000,000.0 |  |  |  |
Aeroleo | Loans Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan payment |  |  | 1,000,000 |  |  |
Foreign Tax Authority | Aeroleo |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Taxes, penalties and interest |  | $ 200,000 | $ 2,500,000 |  |  |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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