Derivative Instruments (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended			9 Months Ended		1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Foreign Currency Hedge Contract [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2011 Foreign Currency Hedge Contract [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2012 Planetsoft [Member]	Sep. 30, 2012 Planetsoft [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 02, 2012 Planetsoft [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	May 31, 2012 Planetsoft [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]
Derivative [Line Items]
Change in unrealized gain (loss) on foreign currency fair value hedging instruments				$ 1,200	$ (1,100)
Foreign currency transaction, realized gain (loss)				729	3,700
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
Put option, price to repurchase shares, discount						10.00%
Put option liability	700		0				700	1,400	1,400
Change in fair value of put option	$ 677	$ (893)