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Stock-Based Incentive Plans (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 1 Months Ended | 6 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Feb. 28, 2011 1994 Plan | Feb. 28, 2010 1994 Plan | Jun. 30, 2011 1994 Plan | Feb. 02, 2010 1994 Plan | Feb. 28, 2011 1995 Plan | Feb. 15, 2011 1995 Plan
Stock-Based Incentive Plans |  |  |  |  |  |  |  |
Number of Stock Incentive Plans | 1 |  |  |  |  |  |  |
Number of Stock Option Plans Superseded | 2 |  |  |  |  |  |  |
Black-Scholes option pricing model assumptions for options granted |  |  |  |  |  |  |  |
Number of Options Granted (in shares) | 1,392 |  | 1,362 | 148 |  |  | 30 |
Risk Free Interest Rate (as a percent) |  |  | 2.62% | 2.93% |  |  | 2.92% |
Dividend Yield (as a percent) |  |  | 1.75% | 1.62% |  |  | 1.76% |
Expected Life (in years) |  |  | 6.2 | 6.5 |  |  | 6.6 |
Volatility (as a percent) |  |  | 39.00% | 36.00% |  |  | 38.00% |
Exercise price for options granted, low end of range (in dollars per share) |  |  | $ 29.66 |  |  |  |  |
Exercise price for options granted, high end of range (in dollars per share) |  |  | $ 32.63 |  |  |  |  |
Exercise Price (in dollars per share) |  |  |  |  |  | $ 24.75 |  | $ 29.58
Weighted Average Fair Value (in dollars per share) |  |  | $ 10.33 | $ 8.46 |  |  | $ 10.49 |
Non-Qualified Stock Options activity |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 1,124 |  |  |  |  |  |  |
Granted (in shares) | 1,392 |  | 1,362 | 148 |  |  | 30 |
Excercised (in shares) | (7) |  |  |  |  |  |  |
Forfeited (in shares) | (16) |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) | 2,493 |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in shares) | 2,436 |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) | 1,083 |  |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 34.19 |  |  |  |  |  |  |
Granted (in dollars per share) | $ 29.66 |  |  |  |  |  |  |
Exercised (in dollars per share) | $ 23.74 |  |  |  |  |  |  |
Forfeited (in dollars per share) | $ 35.69 |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 31.68 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in dollars per share) | $ 31.74 |  |  |  |  |  |  |
Exercisable at end of the period (in dollars per share) | $ 35.04 |  |  |  |  |  |  |
Weighted-Average Remaining Contractual Life |  |  |  |  |  |  |  |
Outstanding at the end of the period (in years) | 4.6 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in years) | 4.6 |  |  |  |  |  |  |
Exercisable at end of the period (in years) | 2.2 |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ 1,873,000 |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period (in dollars) | 1,817,000 |  |  |  |  |  |  |
Exercisable at end of the period (in dollars) | 773,000 |  |  |  |  |  |  |
Closing price of share (in dollars per share) | $ 29.87 |  |  |  |  |  |  |
Total intrinsic value of options exercised (in dollars) | 40,000 | 300,000 |  |  |  |  |  |
Number of shares, unvested options |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) | 180 |  |  |  |  |  |  |
Granted (in shares) | 1,392 |  |  |  |  |  |  |
Vested (in shares) | (161) |  |  |  |  |  |  |
Forfeited (in shares) | (1) |  |  |  |  |  |  |
Unvested at the end of the period (in shares) | 1,410 |  |  |  |  |  |  |
Weighted-Average Grant-Date Fair Value, unvested stock options |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 7.85 |  |  |  |  |  |  |
Granted (in dollars per share) | $ 10.33 |  |  |  |  |  |  |
Vested (in dollars per share) | $ 9.88 |  |  |  |  |  |  |
Forfeited (in dollars per share) | $ 6.55 |  |  |  |  |  |  |
Unvested at the end of the period (in dollars per share) | $ 10.07 |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements (in dollars) |  |  |  |  | $ 9,900,000 |  |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense (in years) |  |  |  |  | 3.5 |  |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(e) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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