v2.4.0.6
Lines Of Credit (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Line of Credit Facility [Line Items]  
Credit Agreement, years five
Credit facility $ 300,000
Credit facility, expiration date 2/2/2017
Credit facility interest accrued, percentage above LIBOR 1.25%
Credit facility, commitment fee per annum on daily unused portion, percent 0.15%
Aggregate amount that may increase under credit facility 100,000
Line of Credit Facility, Amount Outstanding 0
Canadian Subsidiary [Member]
 
Line of Credit Facility [Line Items]  
Credit facility 2,000
Line of Credit Facility, Amount Outstanding $ 0