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LONG-TERM DEBT (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2017 USD ($) | Aug. 31, 2016 EUR (€) | Sep. 30, 2014 CAD | May 31, 2016 USD ($) | Aug. 31, 2015 GBP (£) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments debt |  |  |  |  |  |  | $ 39,301,000 | $ 262,248,000 | $ 52,838,000 |  |
August 2016 Credit Agreement [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | € |  | € 20,000,000 |  |  |  |  |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.20% [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.20% |  |  |  |  |  | 4.20% |  |  | 4.20% |
Basis points | 0.20% |  |  |  |  |  |  |  |  |  |
Debt issuance costs and discounts | $ 5,800,000 |  |  |  |  |  |  |  |  |  |
Debt, fair value |  |  |  |  |  |  | $ 411,000,000 |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.20% [Member] | Debt redemption, period one [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage | 101.00% |  |  |  |  |  |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.20% [Member] | Debt redemption, period two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage | 100.00% |  |  |  |  |  |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 3.75% [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.75% |  |  | 3.75% |  |  | 3.75% |
Basis points |  |  |  | 0.20% |  |  |  |  |  |  |
Debt issuance costs and discounts |  |  |  | $ 7,000,000 |  |  |  |  |  |  |
Debt, fair value |  |  |  |  |  |  | $ 384,000,000 | 371,000,000 |  |  |
Senior notes [Member] | Unsecured Senior Notes, 3.75% [Member] | Debt redemption, period one [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage |  |  |  | 101.00% |  |  |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 3.75% [Member] | Debt redemption, period two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage |  |  |  | 100.00% |  |  |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.60% [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.60% | 4.60% |  |  | 4.60% |
Basis points |  |  |  |  |  | 0.25% |  |  |  |  |
Debt issuance costs and discounts |  |  |  |  |  | $ 11,000,000 |  |  |  |  |
Debt, fair value |  |  |  |  |  |  | $ 1,100,000,000 | $ 1,100,000,000 |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.60% [Member] | Debt redemption, period one [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage |  |  |  |  |  | 101.00% |  |  |  |  |
Senior notes [Member] | Unsecured Senior Notes, 4.60% [Member] | Debt redemption, period two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption percentage |  |  |  |  |  | 100.00% |  |  |  |  |
Line of credit [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | £ |  |  |  |  | £ 20,000,000 |  |  |  |  |  |
Term loan [Member] | British pound term loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | £ |  |  |  |  | £ 160,000,000 |  |  |  |  |  |
Debt, term |  |  |  |  | 5 years |  |  |  |  |  |
Semi annual payments | £ |  |  |  |  | £ 4,000,000 |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  | 1.04% | 1.17% |  | 1.04% | 1.17%
Term loan [Member] | August 2016 Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | € |  | € 110,000,000 |  |  |  |  |  |  |  |  |
Debt, term |  | 5 years |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  | 0.45% |  |  | 0.45% |
Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | CAD |  |  | CAD 175,000,000 |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  | 1.78% |  |  | 1.78% |
Commitment fee percentage |  |  |  |  |  |  | 0.07% |  |  |  |
Long-term debt, outstanding | CAD |  |  |  |  |  |  |  |  |  | CAD 125,000,000 | CAD 135,000,000
Euro term loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments debt | € |  | € 102,500,000 |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Term loan [Member] | British pound term loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  | 0.75% |  |  |  |  |  |
Euro Interbank Offered Rate (EURIBOR) [Member] | Term loan [Member] | August 2016 Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  | 0.45% |  |  |  |  |  |  |  |  |
Canadian Dollar Offered Rate (CDOR) [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  |  | 0.70% |  |  |  |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before 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 + Details
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