INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Average Amortization Period |
12 years
|
12 years
|
|
| Cost |
$ 353,416
|
$ 352,804
|
|
| Accumulated Amortization |
(249,257)
|
(224,420)
|
|
| Net Carrying Value |
104,159
|
128,384
|
|
| Amortization of intangible assets |
25,064
|
$ 25,306
|
$ 22,140
|
| Estimated future amortization [Abstract] |
|
|
|
| 2017 |
20,703
|
|
|
| 2018 |
19,886
|
|
|
| 2019 |
15,784
|
|
|
| 2020 |
11,104
|
|
|
| 2021 |
$ 6,707
|
|
|
| Patents |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Average Amortization Period |
14 years
|
14 years
|
|
| Cost |
$ 12,770
|
$ 12,770
|
|
| Accumulated Amortization |
(12,078)
|
(11,136)
|
|
| Net Carrying Value |
$ 692
|
$ 1,634
|
|
| Trademarks/Tradenames |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Average Amortization Period |
12 years
|
12 years
|
|
| Cost |
$ 117,124
|
$ 116,965
|
|
| Accumulated Amortization |
(82,723)
|
(76,249)
|
|
| Net Carrying Value |
$ 34,401
|
$ 40,716
|
|
| Customer relationships |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Average Amortization Period |
13 years
|
13 years
|
|
| Cost |
$ 217,861
|
$ 217,709
|
|
| Accumulated Amortization |
(150,310)
|
(133,532)
|
|
| Net Carrying Value |
$ 67,551
|
$ 84,177
|
|
| Other |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Average Amortization Period |
4 years
|
5 years
|
|
| Cost |
$ 5,661
|
$ 5,360
|
|
| Accumulated Amortization |
(4,146)
|
(3,503)
|
|
| Net Carrying Value |
$ 1,515
|
$ 1,857
|
|