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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Depreciation Expense | We recognized the following depreciation expense (in thousands):
2017 |  | $ | 42,817 |
2016 |  | 36,212 |
2015 |  | 32,412 |
Property, Plant and Equipment | A summary of our property and equipment as of December 31 is as follows (in thousands):
| Useful Lives (in years) |  | 2017 |  | 2016
Furniture, fixtures, and equipment | 3 to 12 |  | $ | 277,014 |  |  | $ | 236,180 |
Buildings | 3 to 30 |  | 130,712 |  |  | 130,050 |
Corporate aircraft | 10 |  | 11,334 |  |  | 11,334 |
Leasehold improvements | 3 to 15 |  | 50,616 |  |  | 40,312 |
Land |  |  | 23,658 |  |  | 23,635 |
Construction in progress |  |  | 4,575 |  |  | 8,534 |
Less accumulated depreciation |  |  | (267,583 | ) |  | (217,092 | )
Net property and equipment |  |  | $ | 230,326 |  |  | $ | 232,953 |
Schedule of Amortization Expense of Software | We recognized the following amortization expense of purchased and internally developed software (in thousands):
2017 |  | $ | 13,887 |
2016 |  | 11,404 |
2015 |  | 9,624 |
Schedule of Other Assets, Noncurrent | A summary of our purchased and internally developed software as of December 31 is as follows (in thousands):
| 2017 |  | 2016
Purchased software | $ | 25,805 |  |  | $ | 23,753 |
Internally developed software | 55,165 |  |  | 51,507 |
Less accumulated amortization | (54,194 | ) |  | (47,957 | )
Net software | $ | 26,776 |  |  | $ | 27,303 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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