- Acquisitions (Narrative) (Details)			1 Months Ended		3 Months Ended			6 Months Ended
	May. 18, 2015 USD ($) shares	Jan. 08, 2015 USD ($) shares	Oct. 31, 2014 USD ($) shares	Jan. 31, 2014 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($) Company shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Framehawk, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs									$ 100,000
Preliminary consideration				$ 24,200,000
Cash acquired in business combination				200,000
Business Acquisition, Transaction Costs				$ 100,000
RightSignature, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs					$ 0		$ 0	$ 0	0
Preliminary consideration			$ 37,800,000
Cash acquired in business combination			1,100,000
Business Acquisition, Transaction Costs			$ 200,000
Conversion of assumed non-vested stock units to shares of Company stock (shares) | shares			67,500
Sanbolic, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs					0		0	200,000
Preliminary consideration		$ 89,400,000
Cash acquired in business combination		200,000
Business Acquisition, Transaction Costs		$ 400,000
Conversion of assumed non-vested stock units to shares of Company stock (shares) | shares		37,057
Grasshopper Group, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration	$ 161,800,000
Cash acquired in business combination	$ 3,500,000
Conversion of assumed non-vested stock units to shares of Company stock (shares) | shares	105,765
Other 2014 Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs									100,000
Preliminary consideration						$ 19,900,000	17,200,000
Cash acquired in business combination						$ 200,000	800,000
Business Acquisition, Transaction Costs							$ 100,000		$ 100,000
Number of privately-held companies acquired | Company						2
Conversion of assumed non-vested stock units to shares of Company stock (shares) | shares						23,430
General and Administrative Expense [Member] | Grasshopper Group, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs					$ 100,000			$ 400,000
Business Acquisition, Transaction Costs	$ 400,000