Fair value measurements (2011 impairment analyses and acquisitions) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2011
Asset impairment analyses [Abstract]
Carrying value of indefinite-lived trade name	$ 19,100
Excess of fair value over carrying value of indefinite-live trade name	12,000
Excess of fair value over carrying value of reporting unit's net assets, minimum	43,000
Excess of fair value over carrying value of reporting unit's net assets, maximum	546,000
Excess of fair values over carrying values of reporting units net assets, minimum (in hundredths)	55.00%
Excess of fair value over carrying value of reporting unit's net assets, maximum (in hundredths)	442.00%
Acquisitions [Abstract]
Shares of common stock to be issued for acquisition (in shares)	193
Shares of common stock to be issued for acquisition, fair value	4,300
Customer Lists [Member]
Acquisitions [Abstract]
Fair value of intangible assets acquired	12,600
Weighted-average useful life (in years)	8.2
Internal-use software [Member]
Acquisitions [Abstract]
Fair value of intangible assets acquired	9,050
Weighted-average useful life (in years)	5
Trade Names [Member]
Acquisitions [Abstract]
Fair value of intangible assets acquired	$ 8,300
Weighted-average useful life (in years)	9.5

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The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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