Fair Value Measurements (Schedule of Estimated Fair Value of Outstanding Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
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Carrying Amount [Member] | Senior Subordinated Notes [Member] | 2019 Notes [Member]
|
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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]
|
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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]
|
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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]
|
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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 |