Temporary Equity Temporary Equity (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 02, 2012 Planetsoft [Member] Stockholders	Jun. 30, 2012 Planetsoft [Member]	May 31, 2012 Planetsoft [Member] Stockholders
Temporary Equity [Line Items]
Share subscribed for business acquisition, Value	$ 0	$ 87,476,000	$ 828,000	$ 5,000,000.0
Business acquisition, number of common shares issued				296,560
Business acquisition, price per share				$ 16.86
Number of shareholders				3		3
Put option, exercise period					30 days
Put option, vesting period required prior to exercise					2 years
Shares that may be repurchased under put option					296,560
Put option, price to repurchase shares					$ 16.86