XML 46 R24.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Stock-based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted | Weighted-average assumptions used to estimate the grant date fair values for s tock options granted for the three and six month periods ended June 30, 2015 and 2014 follow:
| Three Months Ended |  |  | Six Months Ended |
| June 30, |  |  | June 30, |
| 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Volatility |  | 37.91 | % |  |  | 35.89% |  |  |  | 37.95 | % |  |  | 35.89 | %
Expected term (in years) |  | 5.00 |  |  |  | 5.00 |  |  |  | 5.00 |  |  |  | 5.00 |
Dividend yield |  | 1.97 | % |  |  | 1.21% |  |  |  | 2.00 | % |  |  | 1.17 | %
Risk-free interest rate |  | 1.35 | % |  |  | 1.76% |  |  |  | 1.37 | % |  |  | 1.76 | %
Stock Option Activity | Stock option activity from January 1, 2015 to June 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise |
| Shares |  |  | Price |
Outstanding at January 1, 2015 |  | 6,086,250 |  |  | $ | 22.32 |
Granted |  | 831,000 |  |  | $ | 20.06 |
Exercised |  | — |  |  |  | — |
Cancelled |  | (10,000 | ) |  | $ | 16.59 |
Expired |  | (300,000 | ) |  | $ | 24.63 |
Outstanding at June 30, 2015 |  | 6,607,250 |  |  | $ | 21.94 |
Exercisable at June 30, 2015 | $ | 5,333,927 |  |  | $ | 21.62 |
Restricted Stock Activity | Restricted stock activity from January 1, 2015 to June 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock outstanding at January 1, 2015 |  | 1,493,059 |  |  | $ | 26.93 |
Granted |  | 792,100 |  |  | $ | 20.60 |
Vested |  | (679,565 | ) |  | $ | 24.54 |
Forfeited |  | (46,632 | ) |  | $ | 26.90 |
Non-vested restricted stock outstanding June 30, 2015 |  | 1,558,962 |  |  | $ | 24.76 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2015 to June 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock units outstanding at January 1, 2015 |  | 34,085 |  |  | $ | 30.20 |
Granted |  | 22,100 |  |  | $ | 20.85 |
Vested |  | (14,499 | ) |  | $ | 27.37 |
Forfeited |  | — |  |  |  | — |
Non-vested restricted stock units outstanding June 30, 2015 |  | 41,686 |  |  | $ | 26.22 |
Stock-Settled Performance Units | The total target number of shares with respect to the Stock-Settled Performance Units is set forth below:
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 190,600 |  |  |  | 154,000 |  |  |  | 236,500 |  |  |  | 192,000 |  |  |  | 144,375 |
Fair Value of Stock-Settled Performance Units | The fair value of the Stock-Settled Performance Units is set forth below (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 4,052 |  |  | $ | 5,388 |  |  | $ | 5,564 |  |  | $ | 3,065 |  |  | $ | 5,569 |
Compensation Expense Associated with Stock-Settled Performance Units | These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended June 30, 2014 | NA |  |  | $ | 449 |  |  | $ | 464 |  |  | $ | 255 |  |  | NA |
Three months ended June 30, 2015 | $ | 338 |  |  | $ | 449 |  |  | $ | 464 |  |  | NA |  |  | NA |
Six months ended June 30, 2014 | NA |  |  | $ | 449 |  |  | $ | 928 |  |  | $ | 510 |  |  | $ | 464 |
Six months ended June 30, 2015 | $ | 338 |  |  | $ | 898 |  |  | $ | 928 |  |  | $ | 255 |  |  | NA |

X
- Definition Share based compensation arrangement by share based payment award fair value. + References No definition available. + Details
Name: | pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueTableTextBlock
Namespace Prefix: | pten_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Expense by Award Type [Table Text Block] + References No definition available. + Details
Name: | pten_ShareBasedCompensationExpenseByAwardTypeTextBlock
Namespace Prefix: | pten_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedPerformanceBasedUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration