Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Acquisitions (Allocation of Total Purchase Prices) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Purchase Price Allocation
Goodwill	$ 1,796,851us-gaap_Goodwill	$ 1,768,949us-gaap_Goodwill	$ 1,518,219us-gaap_Goodwill
Framehawk, Inc. [Member]
Purchase Price Allocation
Current assets	569
Property and equipment	36
Deferred tax assets, non-current	2,963
Intangible assets	14,000
Goodwill	11,917
Assets acquired	29,485
Current liabilities assumed	(748)
Long-term liabilities assumed	(3,766)
Deferred tax liabilities, non-current	(564)
Net assets acquired	24,407
Finite-lived intangible assets acquired, Asset Life	7 years
RightSignature, LLC [Member]
Purchase Price Allocation
Current assets	1,305
Intangible assets	27,765
Goodwill	10,694
Assets acquired	39,764
Current liabilities assumed	(826)
Long-term liabilities assumed	(5)
Net assets acquired	38,933
RightSignature, LLC [Member] \| Minimum
Purchase Price Allocation
Finite-lived intangible assets acquired, Asset Life	3 years
RightSignature, LLC [Member] \| Maximum
Purchase Price Allocation
Finite-lived intangible assets acquired, Asset Life	10 years
2014 Other Acquisitions [Member]
Purchase Price Allocation
Current assets	1,423
Other assets	21
Property and equipment	48
Deferred tax assets, non-current	3,128
Intangible assets	19,200
Goodwill	18,344
Assets acquired	42,164
Current liabilities assumed	(2,351)
Deferred tax liabilities, non-current	(1,667)
Net assets acquired	$ 38,146