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DEBT, Existing Credit Agreement (Details) $ in Millions, ¥ in Billions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 JPY (¥) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2017 JPY (¥) | [1] | Oct. 09, 2014 USD ($) | Oct. 09, 2014 JPY (¥)
Existing Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Consolidated leverage ratio | 2.25 |  |  |  |  |
Existing Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Consolidated interest coverage ratio | 3.00 |  |  |  |  |
Term Loan Facility [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Original principal amount | $ 127.5 |  |  |  | $ 127.5 |
Term of facility | 5 years |  |  |  |  |
Outstanding balance | $ 0.0 |  | $ 94.8 |  |  |
Japanese Yen Term Loan Facility [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Original principal amount | ¥ |  | ¥ 6.6 |  |  |  | ¥ 6.6
Term of facility | 5 years |  |  |  |  |
Outstanding balance | $ 0.0 | ¥ 0.0 | 43.5 | ¥ 4.9 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Borrowing capacity |  |  |  |  | $ 187.5 |
Term of facility | 5 years |  |  |  |  |
Outstanding balance | $ 0.0 |  | $ 47.5 |  |  |
[1] | The carrying value of the debt reflects the amounts stated in the above table less debt issuance costs of $4.5 million as of June 30, 2018 related to the credit agreement; and a debt discount of $9.1 million and debt issuance costs of $4.0 million (consisting of $11.1 million related to the Convertible Note and $2.0 million related to the credit agreement) as of December 31, 2017, which is not reflected in this table.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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