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Lines Of Credit (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Two Thousand Twelve Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Debt Instrument, Term 5 years
Credit facility maximum borrowing capacity $ 300,000
Credit facility expiration date Feb. 02, 2017
Credit facility variable interest rate basis spread 1.25%
Credit facility variable interest rate basis LIBOR
Credit facility commitment fee per annum on daily unused portion 0.15%
Credit facility aggregate amount that may increase 100,000
Credit facility covenant terms The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders.
Credit facility amount outstanding 0
Credit facility covenant compliance The Company was in compliance with all covenants of the Credit Facility
Canadian Subsidiary [Member]
  
Line of Credit Facility [Line Items]  
Credit facility maximum borrowing capacity 2,000
Credit facility amount outstanding $ 0
Credit facility covenant compliance The Company was in compliance with all covenants of the Canadian Credit Facility