Fair value measurements (impairment analyses and acquisitions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
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%
Acquisition [Abstract]
Number of business combinations completed		2	2
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
Fair value of intangible assets acquired	55,069	62,232	39,754
Useful life (in years)	6	4	5
Fair value of deferred revenue acquired			7,300
Internal use software [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired	33,169	36,442	24,911
Useful life (in years)	4	4	3
Internal use software [Member] \| Custom Direct [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired		12,587
Useful life (in years)		4.7
Internal use software [Member] \| PsPrint, LLC [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired	9,050
Useful life (in years)	5
Customer lists/relationships [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired	12,600	16,690	13,943
Useful life (in years)	8.2	1.0	7
Customer lists/relationships [Member] \| Custom Direct [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired		15,000
Useful life (in years)		1.3
Customer lists/relationships [Member] \| Abacus America Inc. [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired			11,900
Useful life (in years)			7
Trade names [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired	8,300	9,100	900
Useful life (in years)	9.5	10	10
Trade names [Member] \| Custom Direct [Member]
Acquisition [Abstract]
Fair value of intangible assets acquired		$ 8,900

The amount by which the calculated fair value of the indefinite-lived trade name exceeds the carrying value.

No definition available.

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The maximum amount by which the calculated fair values of the reporting units exceeded the carrying values.

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No definition available.

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The maximum percentage by which the calculated fair values of the reporting units exceeded the carrying values.

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- Definition

Number of business combinations completed by the company during the period.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 99-12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

The amount of acquisition cost of a business combination allocated to deferred revenue of the acquired entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 01-3

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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