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Stock-Based Compensation (Valuation Assumptions) (Details) (Employee Stock Option, Common Stock, USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Stock Option | Common Stock
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average expected option life (in years) 5 years 6 months [1] 5 years 7 months 6 days [1] 6 years [1]
Volatility 54.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [2] 54.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [2] 55.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [2]
Risk-free interest rate 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [3] 1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [3] 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [3]
Dividend Yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [4] 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [4] 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [4]
Weighted-average grant-date fair value per stock option $ 6.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 $ 7.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 $ 6.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
[1] Determined by the historical stock option exercise behavior of the Company's employees (maximum term is 10 years).
[2] Measured using weekly price observations for a period equal to stock options' expected term.
[3] Based upon the U.S. Treasury yields in effect (for a period equaling the stock options' expected term)
[4] The Company has never paid cash dividends on its common stock and does not expect to declare any cash dividends