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Stockholders' Equity (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |
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Feb. 29, 2012 | Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009 | Jan. 31, 2012 | Dec. 31, 2008 | Feb. 28, 2011 2005 Contingent stock plan [Member] | Dec. 31, 2011 2005 Contingent stock plan [Member] | Dec. 31, 2010 2005 Contingent stock plan [Member] | Dec. 31, 2009 2005 Contingent stock plan [Member] | Dec. 31, 2011 2002 Directors Stock Plan [Member] | Dec. 31, 2010 2002 Directors Stock Plan [Member] | Dec. 31, 2009 2002 Directors Stock Plan [Member] | May 31, 2011 2002 Directors Stock Plan amended [Member] | Dec. 31, 2011 PSU awards [Member] | Dec. 31, 2011 2011 Three-year PSU Awards [Member] | Mar. 11, 2011 2011 Three-year PSU Awards [Member] | Dec. 31, 2011 2011 Three-year PSU Awards [Member] Maximum [Member] | Dec. 31, 2011 2011 Three-year PSU Awards [Member] Minimum [Member] | Dec. 31, 2011 2010 Three-year PSU Awards [Member] | Mar. 08, 2011 2010 Three-year PSU Awards [Member] | Dec. 31, 2011 2010 Three-year PSU Awards [Member] Maximum [Member] | Dec. 31, 2011 2010 Three-year PSU Awards [Member] Minimum [Member] | Dec. 31, 2011 2009 Three-year PSU Awards [Member] | Mar. 08, 2010 2009 Three-year PSU Awards [Member] | Dec. 31, 2011 2009 Three-year PSU Awards [Member] Maximum [Member] | Dec. 31, 2011 2009 Three-year PSU Awards [Member] Minimum [Member] | Feb. 28, 2011 2009 Two-year PSU Awards [Member] | Dec. 31, 2011 2009 Two-year PSU Awards [Member] | Dec. 31, 2011 SLO Awards [Member] | Dec. 31, 2010 SLO Awards [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase number of shares of common stock reserved for issuance under the plan |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends accrued in other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under the performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 384,714 |  |  |  | 416,160 |  |  |  | 578,432 |  |  |  |  |  |  |
Increase or decrease in the number of shares earned for each participant based on the performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | up to 10% of target level |  |  |  | up to 10% of target level |  |  |  | up to 10% of target level |  |  |  |  |  |  |
Aggregate increase or decrease in the number of shares earned for all participants based on the performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,471 |  |  |  | 41,616 |  |  |  | 57,843 |  |  |  |  |  |  |
Recordable incident rate to be achieved under additional goal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.20 or better |  |  |  | 1.20 or better |  |  |  | 1.30 or better |  |  |  |  |  |  |
Shares to be issued as a percentage of target shares under the performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% | 0.00% |  |  | 200.00% | 0.00% |  |  | 200.00% | 0.00% |  |  |  |
Per share price of common stock |  |  |  |  |  |  |  | $ 24.93 | $ 21.46 | $ 16.33 | $ 25.77 | $ 21.72 | $ 19.34 |  |  |  | $ 26.18 |  |  |  | $ 20.88 |  |  |  | $ 20.88 |  |  |  |  |  |
Target level for the determination of performance goals and measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Maximum level for the determination of performance goals and measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  | 200.00% |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,357 |  |  |  | 208,080 |  |  |  |  |  |  |  |  |  |  |
Shares at maximum level, net of forfeitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,156,865 |  |  |  |  |  |  |
Share price related to additional goals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.21 |  |  |  |  |  |  |
Shares of common stock issued for the 2009 two-year PSU awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,114,139 | 1,114,139 |  |
Acquired stock under 2005 contingent stock plan |  |  |  |  |  |  | 408,751 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Withheld for Minimum Tax Obligation in Treasury Stock at Fair Value |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental in annual cash bonus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Share based compensation stock award premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% | 25.00%
Restricted stock shares and restricted stock units included in SLO Award target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,926 | 34,596
Issuance of Additional Shares under Amended 2005 Contingent Stock Plan |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities related to Cash awards |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under performance incentive plan at volume target level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,344 |  |  |  | 416,160 |  |  |  |  |  |  |  |  |  |  |
Percentage targeted number of common stock shares net of forfeiture related to volume goal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated dividend payment |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 202,528,616 | 169,272,636 | 168,749,681 | 192,000,000 | 168,111,815 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding |  | 192,062,185 | 159,305,507 |  | 192,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of non vested restricted stock shares |  | 1.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of non vested restricted stock units |  | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of non vested cash awards |  | 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over share issue price |  | 700,000 | 500,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in the beginning of each year to award Performance Share Unit |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share |  | $ 0.52 | $ 0.50 | $ 0.48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid of current quarter in available cash |  | $ 87,400,000 | $ 79,700,000 | $ 75,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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(2)(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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The liabilities paid during the accounting period for equity-based compensation. + 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(2) -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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -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. + Details
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