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Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 01, 2014 Service Life [Member] Equipment [Member] | Sep. 30, 2014 Service Life [Member] Equipment [Member] | Sep. 30, 2014 Service Life [Member] Equipment [Member] | Sep. 30, 2014 Maximum [Member] Service Life [Member] Equipment [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Increase in Estimated Useful Life |  |  |  |  | 5 years |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  | 20 years
Income from operations | $ 147,635 | $ 135,859 | $ 301,725 | $ 268,888 |  | $ 5,400 | $ 16,800 |
Net income | $ 83,276 | $ 77,175 | $ 158,755 | $ 162,137 |  | $ 3,500 | $ 11,000 |
Diluted net income per share (usd per share) | $ 1.31 | $ 1.21 | $ 2.49 | $ 2.50 |  | $ 0.06 | $ 0.17 |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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