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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2015
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | A summary of financial assets and liabilities that are measured at fair value on a recurring basis, as of June 30, 2015 and December 31, 2014 were as follows (in thousands):
| Quoted Prices in Active Markets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |  |
| (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
June 30, 2015 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments available-for-sale: |  |  |  |  |  |  |
Marketable securities - deferred |  |  |  |  |  |  |
compensation plan | $ | — |  |  | $ | 45,530 |  |  | $ | — |  |  | $ | 45,530 |
Marketable securities - other | 2,789 |  |  | — |  |  | — |  |  | 2,789 |
Liabilities: |  |  |  |  |  |  |
Marketable securities - deferred |  |  |  |  |  |  |
compensation plan | — |  |  | 45,012 |  |  | — |  |  | 45,012 |
Contingent consideration | — |  |  | — |  |  | 1,539 |  |  | 1,539 |
December 31, 2014 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments available-for-sale: |  |  |  |  |  |  |
Marketable securities - deferred |  |  |  |  |  |  |
compensation plan | $ | — |  |  | $ | 45,126 |  |  | $ | — |  |  | $ | 45,126 |
Marketable securities - other | 2,257 |  |  | — |  |  | — |  |  | 2,257 |
Liabilities: |  |  |  |  |  |  |
Marketable securities - deferred |  |  |  |  |  |  |
compensation plan | — |  |  | 42,968 |  |  | — |  |  | 42,968 |
Assumptions used in the Monte Carlo simulation | We used the following assumptions in the Monte Carlo simulation lattice option-pricing model:
| June 30, 2015
Assumptions: |
Rig count volatility | 1.74 | %
Cost of debt | 5.18 | %
Date of first contingent consideration payment | December 31, 2016 |
Date of second contingent consideration payment | June 30, 2017 |
Schedule of contingent consideration | The following table sets forth a reconciliation of the changes in the fair value of the contingent consideration payable as classified as Level 3 in the fair value hierarchy (in thousands):
| Significant
| Unobservable
Beginning Balance, December 31, 2014 | $ | — |
Contingent consideration | 1,539 |
Ending Balance, June 30, 2015 | $ | 1,539 |

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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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