LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) $ in Thousands, € in Millions		Dec. 31, 2015 USD ($)		Dec. 31, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Senior Notes		$ 919,812			$ 867,367
2015 Convertible Notes [Member]
Debt Instrument [Line Items]
Senior Notes		$ 0			251,669
2017 PIK Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		15.00%		15.00%
Debt Instrument, Face Amount	[1]	$ 502,504
Debt Instrument, Unamortized Discount	[1]	139,833
Senior Notes		362,671	[1]		265,629
Debt Instrument, Convertible, Carrying Amount of Equity Component	[1]	$ 178,626
2017 Term Loan [Member]
Debt Instrument [Line Items]
Stated interest rate		15.00%		15.00%
Debt Instrument, Face Amount	[2],[3]	$ 38,194
Debt Instrument, Unamortized Discount	[2],[3]	10,309
Senior Notes		27,885	[2],[3]		20,573
Debt Instrument, Convertible, Carrying Amount of Equity Component	[2],[3]	13,199
2018 Euro Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		273,046		€ 250.8
Debt Instrument, Unamortized Discount		0
Senior Notes		273,046			304,496
Debt Instrument, Convertible, Carrying Amount of Equity Component		0
2019 Euro Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		256,210		€ 235.3
Debt Instrument, Unamortized Discount		0
Senior Notes		256,210			0
Debt Instrument, Convertible, Carrying Amount of Equity Component		0
2021 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		0
Debt Instrument, Unamortized Discount		0
Senior Notes		0			$ 25,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	[3]	$ 50,596

[1] (1) The principal amount presented represents the original principal amount of US$ 400.0 million plus interest paid in kind by adding such amount to the original principal amount. The equity component represents the fair value ascribed to the Unit Warrants (see Note 13, "Equity"). The fair value of the equity component is accounted for as a discount on the 2017 PIK Notes and is being amortized over the life of the 2017 PIK Notes using the effective interest method.

[2] (2) The principal amount presented represents the original principal amount of US$ 30.0 million plus interest paid in kind by adding such amount to the original principal amount.

[3] (3) The equity component of the 2017 Term Loan and 2021 Revolving Credit Facility represents the fair value ascribed to the Initial Warrants (as described in Note 13, "Equity") issued in consideration for these facilities based on their relative borrowing capacities. The fair value is accounted for as a discount on the 2017 Term Loan, which is being amortized over the life of the 2017 Term Loan using the effective interest method; and as debt issuance costs for the 2021 Revolving Credit Facility, which is being amortized on a straight-line basis over the life of the 2021 Revolving Credit Facility.