Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended			0 Months Ended	1 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jun. 02, 2012 Planetsoft [Member]	Jun. 30, 2012 Planetsoft [Member]	Mar. 31, 2013 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]	Mar. 31, 2013 Foreign Currency Hedge Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2012 Foreign Currency Hedge Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2013 Foreign Currency Hedge Contract [Member] Not Designated as Hedging Instrument [Member]	Mar. 31, 2012 Foreign Currency Hedge Contract [Member] Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Change in unrealized gain (loss) on foreign currency fair value hedging instruments								$ 0	$ 1,200,000
Foreign currency transaction, realized gain (loss)										(170,000)	(1,500,000)
Put option, exercise period				30 days
Put option, vesting period required prior to exercise				2 years	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	1,105,000		1,186,000			1,100,000	1,400,000
Change in fair value of put option	$ 81,000	$ 0