XML 26 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
Lines Of Credit (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Two Thousand Twelve Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Credit Agreement, years five
Credit facility $ 300,000
Credit facility, expiration date Feb. 02, 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