REVENUES - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Contract Assets |
|
|
|
| Beginning balance, net of allowance |
$ 292,863
|
$ 354,422
|
$ 364,082
|
| Additions (collections), net, and other |
54,307
|
(57,920)
|
(3,118)
|
| Bad debt, net of recoveries |
(2,740)
|
(3,639)
|
(6,542)
|
| Ending balance, net of allowance |
344,430
|
292,863
|
354,422
|
| Accounts receivable from leases, net of allowance |
315,033
|
300,207
|
343,161
|
| Total accounts receivable, net of allowance |
659,463
|
593,070
|
697,583
|
| Contract Liabilities |
|
|
|
| Beginning balance |
28,067
|
38,096
|
37,119
|
| Revenue recognized, included in beginning balance |
(27,094)
|
(35,933)
|
(34,480)
|
| Additions, net of revenue recognized during period, and other |
26,948
|
25,904
|
35,457
|
| Ending balance |
27,921
|
28,067
|
38,096
|
| Deferred income from leases |
38,514
|
41,587
|
53,420
|
| Total deferred income |
66,435
|
69,654
|
91,516
|
| Less: Non-current portion, included in other long-term liabilities |
7,257
|
2,649
|
105
|
| Total deferred income, current portion |
$ 59,178
|
$ 67,005
|
$ 91,411
|