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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |
Income from operations | $ 7,987 | $ 10,049 | $ 8,048 | $ 6,471 | $ 4,754 | $ 6,666 | $ 5,468 | $ 5,331 | $ 32,555 | $ 22,219 | $ 30,455
Net income | $ 5,123 | $ 6,394 | $ 5,099 | $ 4,043 | $ 3,811 | $ 4,074 | $ 3,024 | $ 3,276 | $ 20,659 | $ 14,185 | $ 17,961
Diluted (in dollars per share) | $ 0.29 | $ 0.37 | $ 0.29 | $ 0.24 | $ 0.22 | $ 0.24 | $ 0.18 | $ 0.19 | $ 1.19 | $ 0.83 | $ 1.06
Restatement of opening retained earnings | Uncollectible Receivables |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  |  |  | $ 300
Net income |  |  |  |  |  |  |  |  |  |  | $ 200
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.01

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