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Fair Value Measurements (Schedule of Estimated Fair Value of Outstanding Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying Amount [Member] | Senior Subordinated Notes [Member] | 2019 Notes [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure $ 161,279 $ 149,800
Carrying Amount [Member] | Term Loan [Member] | Silicon Valley Bank term loan and Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure 80,000 80,000
Carrying Amount [Member] | Line of Credit [Member] | Silicon Valley Bank term loan and Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure 2,884 5,260
Fair Value [Member] | Senior Subordinated Notes [Member] | 2019 Notes [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure 337,928 280,111
Fair Value [Member] | Term Loan [Member] | Silicon Valley Bank term loan and Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure 79,884 79,542
Fair Value [Member] | Line of Credit [Member] | Silicon Valley Bank term loan and Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Fair Value Disclosure $ 2,884 $ 5,253