Business Combinations (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 23, 2012	Aug. 14, 2012
Business Acquisition [Line Items]
Total purchase price	$ 39,728,000		$ 27,379,000
Cash paid for acquisition, net of cash acquired	9,100,000		27,210,000
Merger-related costs	3,075,000	2,069,000	1,852,000
Shares issued price per share				$ 11.00
Common stock issued in acquisition, value	30,615,000
Unicorn [Member]
Business Acquisition [Line Items]
Business acquisition date	Jan. 31, 2014
Total purchase price	39,728,000
Cash paid for acquisition, net of cash acquired	9,100,000
Merger-related costs	2,999,000
Revenue since acquisition	6,478
Retention Payment	1,600,000
Merger-related compensation expense	1,251,000
Shares issued price per share	$ 10.74
Common stock issued in acquisition	2,850,547
Shares placed into escrow account	1,285,715
Zencoder [Member]
Business Acquisition [Line Items]
Business acquisition date			Aug. 14, 2012
Total purchase price					$ 27,400,000