XML 36 R26.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Cash and Cash Equivalents and Short-term Investments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2013
Cash and Cash Equivalents and Short-term Investments |
Cash and cash equivalents and short-term investments |
|  | June 30, |  | December 31, |
|  | 2013 |  | 2012 |
|  | (In thousands) |
Cash and cash equivalents |  | $ | 508,128 |  | $ | 524,922 |
Short-term investments: |  |  |  |  |
Trading equity securities |  | $ | — |  | $ | 52,705 |
Available-for-sale equity securities |  | 78,662 |  | 174,610 |
Available-for-sale debt securities |  | 21,170 |  | 25,967 |
Total short-term investments |  | $ | 99,832 |  | $ | 253,282 |
Certain information related to our cash and cash equivalents and short term investments |
|  | June 30, 2013 |  | December 31, 2012 |
|  | Fair Value |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |
|  | (In thousands) |
Cash and cash equivalents |  | $ | 508,128 |  | $ | — |  | $ | — |  | $ | 524,922 |  | $ | — |  | $ | — |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Trading equity securities |  | — |  | — |  | — |  | 52,705 |  | 46,981 |  | — |
Available-for-sale equity securities |  | 78,662 |  | 50,115 |  | — |  | 174,610 |  | 137,282 |  | (1,030 | )
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper and CDs |  | — |  | — |  | — |  | 206 |  | — |  | — |
Corporate debt securities |  | 19,685 |  | 4,432 |  | — |  | 23,399 |  | 1,870 |  | — |
Mortgage-backed debt securities |  | 216 |  | 13 |  | — |  | 244 |  | 15 |  | — |
Mortgage-CMO debt securities |  | 209 |  | 4 |  | (3 | ) | 523 |  | 10 |  | (3 | )
Asset-backed debt securities |  | 1,060 |  | — |  | (88 | ) | 1,595 |  | 28 |  | (192 | )
Total available-for-sale debt securities |  | 21,170 |  | 4,449 |  | (91 | ) | 25,967 |  | 1,923 |  | (195 | )
Total available-for-sale securities |  | 99,832 |  | 54,564 |  | (91 | ) | 200,577 |  | 139,205 |  | (1,225 | )
Total short-term investments |  | 99,832 |  | 54,564 |  | (91 | ) | 253,282 |  | 186,186 |  | (1,225 | )
Total cash, cash equivalents and short-term investments |  | $ | 607,960 |  | $ | 54,564 |  | $ | (91 | ) | $ | 778,204 |  | $ | 186,186 |  | $ | (1,225 | )
Gross unrealized losses of cash and cash equivalents and short-term investments |
|  | As of June 30, 2013 |
|  | Less Than 12 Months |  | More Than 12 Months |
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |
|  | (In thousands) |
Available-for-sale equity securities |  | $ | — |  | $ | — |  | $ | — |  | $ | — |
Available-for-sale debt securities: (1) |  |  |  |  |  |  |  |  |
Mortgage-CMO debt securities |  | 21 |  | (2 | ) | 108 |  | (1 | )
Asset-backed debt securities |  | 554 |  | (1 | ) | 506 |  | (87 | )
Total available-for-sale debt securities |  | 575 |  | (3 | ) | 614 |  | (88 | )
Total |  | $ | 575 |  | $ | (3 | ) | $ | 614 |  | $ | (88 | )
(1) Our unrealized losses on available-for-sale debt securities held for more than one year are comprised of various types of securities. Each of these securities has a rating ranging from “A” to “AAA” from Standard & Poor’s and ranging from “A2” to “Aaa” from Moody’s Investors Service and is considered to be of high credit quality. In each case, we do not intend to sell these investments, and it is less likely than not that we will be required to sell them to satisfy our own cash flow and working capital requirements. We believe that we will be able to collect all amounts due according to the contractual terms of each investment and, therefore, do not consider the decline in value of these investments to be other-than-temporary at June 30, 2013.
Estimated fair values of corporate, mortgage-backed, mortgage-CMO and asset-backed debt securities |
|  | Estimated |
|  | Fair Value |
|  | June 30, 2013 |
|  | (In thousands) |
Debt securities: |  |  |
Due in one year or less |  | $ | — |
Due after one year through five years |  | 15,413 |
Due in more than five years |  | 5,757 |
Total debt securities |  | $ | 21,170 |
Debt and equity securities |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  | (In thousands) |
Available-for-sale |  |  |  |  |  |  |  |  |
Proceeds from sales and maturities |  | $ | 20,352 |  | $ | 796 |  | $ | 106,953 |  | $ | 19,233 |
Realized gains (losses), net |  | $ | 12,183 |  | $ | 19 |  | $ | 88,157 |  | $ | 12,484 |

X
- Definition Tabular disclosure of cash and cash equivalents and short-term investments. + References No definition available. + Details
Name: | nbr_CashAndCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | nbr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of realized gains and losses on investments reported in the statement of income. + References No definition available. + Details
Name: | us-gaap_RealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration