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Accounts Receivable - Balance and Activity in Allowance for Doubtful Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts Receivable, Net, Current [Abstract]      
Allowance for doubtful accounts at January 1 $ 3,906 $ 1,503 $ 3,590
Additions charged to costs and expenses 1,735 2,511 129
Deductions (6) [1] (108) [1] (2,216) [1]
Allowance for doubtful accounts at December 31 $ 5,635 $ 3,906 $ 1,503
[1] Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.