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Deferred Revenue-Right-to-use contracts and Deferred commission expense (Tables) | 3 Months Ended
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Mar. 31, 2013
Components of Change in Deferred Revenue-Right-to-Use Contracts and Deferred Commission Expense | Components of the change in deferred revenue-right-to-use contracts and deferred commission expense are as follows (amounts in thousands):
| Quarters Ended March 31,
| 2013 |  | 2012
Deferred revenue – right-to-use contracts, as of January 1, | $ | 62,979 |  |  | $ | 56,285 |
Deferral of new right-to-use contracts | 2,831 |  |  | 2,244 |
Deferred revenue recognized | (1,791 | ) |  | (1,637 | )
Net increase in deferred revenue | 1,040 |  |  | 607 |
Deferred revenue – right-to-use contracts, as of March 31, | $ | 64,019 |  |  | $ | 56,892 |
Deferred commission expense, as of January 1, | $ | 22,842 |  |  | $ | 19,687 |
Costs deferred | 1,093 |  |  | 794 |
Commission expense recognized | (630 | ) |  | (552 | )
Net increase in deferred commission expense | 463 |  |  | 242 |
Deferred commission expense, as of March 31, | $ | 23,305 |  |  | $ | 19,929 |

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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=6600647&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=6361293&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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