Summary of Operations and Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended				0 Months Ended				6 Months Ended		12 Months Ended		12 Months Ended			0 Months Ended
	Jun. 07, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segment	Jun. 30, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Apr. 30, 2010 Two Thousand Employee Stock Purchase Plan [Member]	Mar. 31, 2000 Two Thousand Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan, 2010 [Member]	Jun. 30, 2010 Employee Stock Purchase Plan, 2010 [Member]	Jun. 30, 2013 Incentive Stock Option [Member]	Dec. 31, 1998 Incentive Stock Option [Member] Nineteen Ninety Eight Plan [Member] Maximum [Member]	Dec. 31, 2000 Incentive Stock Option [Member] Two Thousand Plan [Member]	Dec. 31, 2000 Incentive Stock Option [Member] Nineteen Ninety Eight and Two Thousand Plan [Member]	Dec. 31, 2009 Incentive Stock Option [Member] Two Thousand Nine Plan [Member]	Jun. 30, 2013 Incentive Stock Option [Member] Two Thousand Nine Plan [Member]	Jun. 07, 2012 Incentive Stock Option [Member] Two Thousand Nine Plan [Member]	Jun. 07, 2012 Incentive Stock Option [Member] Two Thousand Nine Plan [Member] 2009 Plan [Member]
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]
Typical service agreements				12 months
Typical service agreements termination notice period						30 days	90 days
Fees and related labor costs, recognition period (current estimate of term of customer relationship)				48 months
Weighted average fair value of stock options granted		$ 5.72	$ 8.29	$ 6.16	$ 7.24
Shares of common stock available for issuance									450,000	769,000	1,000,000		5,850,000		10,000,000		15,200,000	23,817,744
Increase in number of shares of common stock available for issuance														4,150,000		6,000,000			4,250,000
Stock option term	10 years
Dividend yield		0.00%	0.00%	0.00%	0.00%
Unrecognized compensation cost related to nonvested share-based compensation arrangements												$ 32,118,000
Weighted average recognition period of unrecognized compensation cost												1 year 9 months 18 days
Shares of common stock available for issuance, expiration date								Apr. 01, 2010
Total value of stock options exercised				1,300,000,000
Total intrinsic value of options exercisable		11,239,000		11,239,000
Total intrinsic value of nonvested options		875,000		875,000
Total intrinsic value of all outstanding options		12,114,000		12,114,000
Effect of option to purchase share of common stock on diluted net income per share		3,194,515	5,315,243	3,385,645	4,141,393
Weighted average exercise price of options			$ 6.87		$ 5.60
Number of operating segments				2
Aggregate amortization expense for intangible assets		466,000	77,000	884,000	153,000
Estimated amortization expense in 2013		2,170,000		2,170,000
Estimated amortization expense in 2014		4,133,000		4,133,000
Estimated amortization expense in 2015		3,771,000		3,771,000
Estimated amortization expense in 2016		3,316,000		3,316,000
Estimated amortization expense in 2017		1,344,000		1,344,000
Estimated amortization expenses thereafter 2017		$ 113,000		$ 113,000