Acquisitions (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	0 Months Ended
	Mar. 30, 2015	Oct. 31, 2014	Dec. 31, 2014	Jan. 31, 2014	Jun. 30, 2014	Jan. 08, 2015	Mar. 31, 2015	Mar. 31, 2014
Grasshopper Group, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Purchase agreement	$ 172,500,000
RightSignature, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration		37,800,000
Cash acquired in business combination		1,100,000
Transaction costs		200,000					0	0
Conversion of assumed non-vested stock units to shares of Company stock (shares)			67,500
Framehawk, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration				24,200,000
Cash acquired in business combination				200,000
Transaction costs								100,000
Other 2014 Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration			19,900,000		17,200,000
Cash acquired in business combination			200,000		800,000
Number of privately-held companies acquired			2
Conversion of assumed non-vested stock units to shares of Company stock (shares)			23,430
Sanbolic, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration						89,500,000
Cash acquired in business combination						200,000
Transaction costs						400,000
Conversion of assumed non-vested stock units to shares of Company stock (shares)						37,057
General and Administrative Expense [Member] | Other 2014 Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Transaction costs								100,000
General and Administrative Expense [Member] | Sanbolic, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Transaction costs							$ 200,000