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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets, Segment Reporting, Insurance Reserves and Capitalized Interest (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting |  |  |
Number of operating segments | item | 2 |  |
Number of reportable segments | item | 1 |  |
Self-insurance Reserves |  |  |
Period for reviewing actual expenditure to determine self-insurance reserve | 12 months |  |
Capitalized Interest |  |  |
Capitalized interest costs | $ | $ 533 | $ 152 | $ 0
Customer Relationships |  |  |
Finite-lived intangible assets |  |  |
Net intangible asset | $ | $ 6,200 | $ 7,400 |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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