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CERTAIN RELATIONSHIPS AND RELATED-PARTY TRANSACTIONS (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Director related party [Member]
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| Related Party Transaction [Line Items] | |||||
| Revenue from transactions with related parties | $ 0 | $ 3,423,000 | $ 2,475,000 | $ 8,169,000 | |
| Expenses from transactions with related party | 1,473,000 | 6,360,000 | 3,527,000 | 9,604,000 | |
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ATC Aviation Inc. [Member]
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| Related Party Transaction [Line Items] | |||||
| Expenses from transactions with related party | 400,000 | 1,000,000 | |||
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Sublease [Member]
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| Related Party Transaction [Line Items] | |||||
| Expenses from transactions with related party | (200,000) | (400,000) | |||
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Other related-parties [Member]
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| Related Party Transaction [Line Items] | |||||
| Revenue from transactions with related parties | 1,627,000 | 861,000 | 2,954,000 | 2,315,000 | |
| Expenses from transactions with related party | 2,677,000 | 2,158,000 | 7,827,000 | 4,034,000 | |
| Receivable balance | $ 11,500,000 | $ 11,500,000 | $ 12,200,000 | ||