DEBT (Details)
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3 Months Ended |
9 Months Ended |
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Aug. 11, 2016
USD ($)
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Sep. 30, 2016
USD ($)
$ / shares
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Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
USD ($)
trading_day
$ / shares
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Sep. 30, 2015
USD ($)
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Aug. 31, 2016
USD ($)
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| Debt Instrument [Line Items] |
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| Proceeds from issuance of convertible senior notes, net of issuance costs |
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$ 47,575,000
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$ 0
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| Deferred convertible senior notes issuance costs |
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486,000
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0
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| Repayments of Lines of Credit |
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19,500,000
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25,000,000
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| Interest Expense |
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$ 1,319,000
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$ 110,000
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2,705,000
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$ 354,000
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| Letter of credit |
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$ 6,000,000
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|
6,000,000
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| Convertible Senior Notes Due 2036 |
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| Debt Instrument [Line Items] |
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| Principal amounts of debt |
$ 50,000,000
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$ 50,000,000
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| Interest rate (as a percent) |
4.125%
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| Proceeds from issuance of convertible senior notes, net of issuance costs |
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47,091,000
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| Deferred convertible senior notes issuance costs |
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$ 2,909,000
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| Convertible debt, threshold trading days | trading_day |
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20
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| Convertible debt, threshold consecutive trading days |
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30 days
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| Convertible debt, threshold percentage of stock price trigger |
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130.00%
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| Convertible debt, measurement period (in trading days) |
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5 days
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| Convertible debt, maximum percentage of trading price per $1,000 principal amount trigger |
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98.00%
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| Convertible debt, conversion ratio |
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0.0457603
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| Convertible debt, conversion price (in usd per share) | $ / shares |
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$ 21.85
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$ 21.85
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| Fair value of long term debt |
$ 38,334,000
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$ 36,352,000
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$ 36,352,000
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| Fair value of embedded conversion option |
$ 11,666,000
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| Interest expense |
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558,000
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|
558,000
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| Interest expense to be paid in cash |
|
281,000
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281,000
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| Interest expense, non cash accretion of debt discount |
|
277,000
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|
277,000
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| Long-term debt |
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$ 38,648,000
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$ 38,648,000
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| Revolving Credit Facility |
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| Debt Instrument [Line Items] |
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| Long-term debt, average interest rate (as a percent) |
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4.25%
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4.25%
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| Unused borrowing capacity |
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$ 46,558,000
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$ 46,558,000
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| Revolving Credit Facility | October 2015 Amendment |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
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55,000,000
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55,000,000
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| Revolving Credit Facility | Credit Agreement 2012 |
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| Debt Instrument [Line Items] |
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| Interest Expense |
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143,000
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263,000
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| Revolving Credit Facility | Line of Credit | Amended Credit Agreement 2012 |
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| Debt Instrument [Line Items] |
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| Maximum amount of distributions for interest payments |
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4,000,000
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| Maximum amount of distributions for cash payments |
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$ 1,500,000
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| Revolving Credit Facility | Line of Credit | Credit Agreement 2012 |
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| Debt Instrument [Line Items] |
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| Amortization of Financing Costs |
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51,000
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143,000
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| Letter of Credit | Line of Credit | Amended Credit Agreement 2012 |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
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10,000,000
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10,000,000
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| Revolving Credit Facility, Swing Line Loan | Line of Credit | Amended Credit Agreement 2012 |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Maximum Borrowing Capacity |
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$ 5,000,000
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|
5,000,000
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| Accounting Standards Update 2015-03 | Long-term Debt | Convertible Senior Notes Due 2036 |
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| Debt Instrument [Line Items] |
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| Deferred convertible senior notes issuance costs |
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(2,228,000)
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| Accounting Standards Update 2015-03 | Additional Paid-in Capital | Convertible Senior Notes Due 2036 |
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| Debt Instrument [Line Items] |
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| Deferred convertible senior notes issuance costs |
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$ (681,000)
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