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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
	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	$ 2,538,940us-gaap_Revenues	$ 2,626,448us-gaap_Revenues	$ 2,511,638us-gaap_Revenues	$ 2,260,863us-gaap_Revenues	$ 2,279,492us-gaap_Revenues	$ 2,340,147us-gaap_Revenues	$ 2,335,110us-gaap_Revenues	$ 1,963,832us-gaap_Revenues	$ 9,937,889us-gaap_Revenues	$ 8,918,581us-gaap_Revenues	$ 7,476,100us-gaap_Revenues
Gross profit	365,959us-gaap_GrossProfit	374,709us-gaap_GrossProfit	369,148us-gaap_GrossProfit	338,122us-gaap_GrossProfit	321,321us-gaap_GrossProfit	329,462us-gaap_GrossProfit	341,274us-gaap_GrossProfit	300,489us-gaap_GrossProfit	1,447,938us-gaap_GrossProfit	1,292,546us-gaap_GrossProfit	1,117,252us-gaap_GrossProfit
Net income	$ 18,677us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 26,162us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 16,862us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 31,303us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 21,721us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 32,765us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 37,388us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 22,118us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 93,004us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 113,992us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Basic earnings per common share	$ 0.77us-gaap_EarningsPerShareBasic	$ 1.07us-gaap_EarningsPerShareBasic	$ 0.70us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 1.34us-gaap_EarningsPerShareBasic	$ 1.53us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 3.82us-gaap_EarningsPerShareBasic	$ 4.72us-gaap_EarningsPerShareBasic	$ 4.39us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.77us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 1.19us-gaap_EarningsPerShareDiluted	$ 0.81us-gaap_EarningsPerShareDiluted	$ 1.19us-gaap_EarningsPerShareDiluted	$ 1.43us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 3.60us-gaap_EarningsPerShareDiluted	$ 4.32us-gaap_EarningsPerShareDiluted	$ 4.19us-gaap_EarningsPerShareDiluted

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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