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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 2,538,940 us-gaap_Revenues | $ 2,626,448 us-gaap_Revenues | $ 2,511,638 us-gaap_Revenues | $ 2,260,863 us-gaap_Revenues | $ 2,279,492 us-gaap_Revenues | $ 2,340,147 us-gaap_Revenues | $ 2,335,110 us-gaap_Revenues | $ 1,963,832 us-gaap_Revenues | $ 9,937,889 us-gaap_Revenues | $ 8,918,581 us-gaap_Revenues | $ 7,476,100 us-gaap_Revenues
Gross profit | 365,959 us-gaap_GrossProfit | 374,709 us-gaap_GrossProfit | 369,148 us-gaap_GrossProfit | 338,122 us-gaap_GrossProfit | 321,321 us-gaap_GrossProfit | 329,462 us-gaap_GrossProfit | 341,274 us-gaap_GrossProfit | 300,489 us-gaap_GrossProfit | 1,447,938 us-gaap_GrossProfit | 1,292,546 us-gaap_GrossProfit | 1,117,252 us-gaap_GrossProfit
Net income | $ 18,677 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 26,162 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 16,862 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 31,303 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 21,721 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 32,765 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 37,388 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 22,118 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 93,004 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 113,992 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Basic earnings per common share | $ 0.77 us-gaap_EarningsPerShareBasic | $ 1.07 us-gaap_EarningsPerShareBasic | $ 0.70 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 0.89 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.53 us-gaap_EarningsPerShareBasic | $ 0.95 us-gaap_EarningsPerShareBasic | $ 3.82 us-gaap_EarningsPerShareBasic | $ 4.72 us-gaap_EarningsPerShareBasic | $ 4.39 us-gaap_EarningsPerShareBasic
Diluted earnings per common share | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 1.03 us-gaap_EarningsPerShareDiluted | $ 0.62 us-gaap_EarningsPerShareDiluted | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 0.81 us-gaap_EarningsPerShareDiluted | $ 1.19 us-gaap_EarningsPerShareDiluted | $ 1.43 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 3.60 us-gaap_EarningsPerShareDiluted | $ 4.32 us-gaap_EarningsPerShareDiluted | $ 4.19 us-gaap_EarningsPerShareDiluted

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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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