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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accrued Expenses    
Royalty tax withholdings $ 6,085 $ 5,305
Compensation 6,527 6,379
Non-income taxes 4,287 3,994
Professional fees 681 605
Marketing 212 475
Construction costs 98 4,501
Other expenses 4,504 2,379
Total accrued expenses $ 22,394 $ 23,638