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Deferred Revenue-entry of right-to-use contracts and Deferred Commission Expense (Tables) | 12 Months Ended
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Dec. 31, 2014
Components of Change in Deferred Revenue-Entry of Right-to-Use Contracts and Deferred Commission Expense | Components of the change in deferred revenue-entry of right-to-use contracts and deferred commission expense are as follows (amounts in thousands):
|  | 2014 |  | 2013
Deferred revenue—upfront payments from right-to-use contracts, as of January 1, |  | $ | 68,673 |  |  | $ | 62,979 |
Right-to-use contracts current period, gross |  | 13,892 |  |  | 13,815 |
Revenue recognized from right-to-use contract upfront payments |  | (8,391 | ) |  | (8,121 | )
Right-to-use contract upfront payments, deferred, net |  | 5,501 |  |  | 5,694 |
Deferred revenue—upfront payments from right-to-use contracts, as of December 31, |  | $ | 74,174 |  |  | $ | 68,673 |
Deferred commission expense, as of January 1, |  | $ | 25,251 |  |  | $ | 22,841 |
Deferred commission expense |  | 6,272 |  |  | 5,011 |
Commission expense recognized |  | (2,934 | ) |  | (2,601 | )
Net increase in deferred commission expense |  | 3,338 |  |  | 2,410 |
Deferred commission expense, as of December 31, |  | $ | 28,589 |  |  | $ | 25,251 |

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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