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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for doubtful accounts at January 1 $ 5,635 $ 3,906 $ 1,503
Additions charged to costs and expenses(1) 5,497 [1] 1,735 [1] 2,511 [1]
Deductions(2) (71) [2] (6) [2] (108) [2]
Allowance for doubtful accounts at December 31 $ 11,061 $ 5,635 $ 3,906
[1] Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013 primarily due to bankruptcy status of customers.
[2] Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.