LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Overview (Details) $ in Thousands, € in Millions		Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt Issuance Costs, Noncurrent, Net		$ 12,947		$ 15,019
Long-term debt		1,079,187		999,209
2018 Euro Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		240,819	€ 200.8
Debt Issuance Costs, Noncurrent, Net	[1]	274
Long-term debt		240,545		263,734
2019 Euro Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		282,238	235.3
Debt Issuance Costs, Noncurrent, Net	[1]	367
Long-term debt		281,871		247,594
2021 Euro Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		562,232	€ 468.8
Debt Issuance Costs, Noncurrent, Net	[1]	5,461
Long-term debt		556,771		$ 487,881
2021 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		0
Debt Issuance Costs, Noncurrent, Net	[1]	0
Long-term debt		0
Senior Debt and Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		1,085,289
Debt Issuance Costs, Noncurrent, Net	[1]	6,102
Long-term debt		$ 1,079,187

[1] (1) Debt issuance costs related to the 2018 Euro Term Loan, 2019 Euro Term Loan and 2021 Euro Term Loan are being amortized on a straight-line basis, which approximates the effective interest method, over the life of the respective instruments. Debt issuance costs related to the 2021 Revolving Credit Facility are classified as non-current assets in our consolidated balance sheet and are being amortized on a straight-line basis over the life of the 2021 Revolving Credit Facility.