Derivatives and Hedging Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Swap_Agreement	Sep. 30, 2011	Sep. 30, 2012 Swap_Agreement	Sep. 30, 2011
Derivatives and Hedging Instruments (Textual) [Abstract]
Number of interest rate swap agreements outstanding	6		6
Cash payments of future forecasted transactions in Indian rupees maximum			Up to 36 Months
Notional amount of the forward contracts to buy Indian rupees	$ 41.6		$ 41.6
Net derivative loss included in OCI will be reclassified into earnings			0.6
Gains or losses were reclassified from OCI into earnings	0	0	0	0
Interest rate swap agreements [Member]
Derivative [Line Items]
Notional amount of derivative instruments	$ 150.0		$ 150.0