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FINANCIAL INSTRUMENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands

1 Months Ended

12 Months Ended

Mar. 13, 2017

Oct. 31, 2017

Dec. 31, 2017

Sep. 30, 2017

Mar. 07, 2017

Dec. 31, 2016

Fair Value Measurements

Price per share (in dollars per share)

$ 45.65

Debt Instrument, Convertible, Conversion Premium, Shares

10,000

Estimated conversion value

$ 300

Payments to Acquire Businesses, Net of Cash Acquired

$ 15,000

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

$ 10,000

Equity investments

14,146

$ 0

Investments, Contingent Purchase Obligation

$ 900

Convertible Senior Notes Due 2022 [Member]

Fair Value Measurements

Price per share (in dollars per share)

$ 48.65

Initial conversion price of notes into common stock (in dollars per share)

$ 66.89

Notes

Fair Value Measurements

Initial conversion price of notes into common stock (in dollars per share)

$ 24.82

Maximum

Fair Value Measurements

Debt Instrument, Convertible, Conversion Premium, Shares

10,000

Maximum | Convertible Senior Notes Due 2022 [Member]

Fair Value Measurements

Debt Instrument, Convertible, Conversion Premium, Shares

5,200,000

Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member] | Level 1

Fair Value Measurements

Long-term debt-current and long-term

^[1]

$ 0

Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member] | Level 2

Fair Value Measurements

Long-term debt-current and long-term

^[1]

361,526

Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member] | Level 3

Fair Value Measurements

Long-term debt-current and long-term

^[1]

0

Unsecured Debt [Member] | Notes | Level 1

Fair Value Measurements

Long-term debt-current and long-term

^[2]

0

Unsecured Debt [Member] | Notes | Level 2

Fair Value Measurements

Long-term debt-current and long-term

^[2]

644

Unsecured Debt [Member] | Notes | Level 3

Fair Value Measurements

Long-term debt-current and long-term

^[2]

0

Unsecured Debt [Member] | Carrying Value | Convertible Senior Notes Due 2022 [Member]

Fair Value Measurements

Long-term debt-current and long-term

^[1]

276,173

Unsecured Debt [Member] | Carrying Value | Notes

Fair Value Measurements

Long-term debt-current and long-term

^[2]

$ 324

[1]

The closing price of the Company’s common stock was $45.65 per share at December 31, 2017 compared to a conversion price of $66.89 per share. Currently, the conversion price is above the stock price. The maximum conversion premium that can be due on the 2022 Notes is approximately 5.2 million shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.

[2]

The closing price of the Company’s common stock was $45.65 per share at December 31, 2017 compared to a conversion price of $24.82 per share which, if converted, would result in a conversion premium of less than ten thousand shares of the Company’s common stock or $0.3 million of cash. The maximum conversion premium that can be due on the 2019 Notes is approximately ten thousand shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.

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