Acquisitions - Progressive Acquisition Pro Forma Financial Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Revenues, as reported	$ 821,814us-gaap_SalesRevenueNet	$ 585,423us-gaap_SalesRevenueNet
Net earnings, as reported	49,243us-gaap_NetIncomeLoss	38,339us-gaap_NetIncomeLoss
Progressive Finance Holdings, LLC
Business Acquisition [Line Items]
Revenues, pro forma		732,300
Net earnings, pro forma		$ 39,389

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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