Earnings (Loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income (loss)	$ (2,145)us-gaap_NetIncomeLoss	$ (239)us-gaap_NetIncomeLoss	$ (1,468)us-gaap_NetIncomeLoss	$ (3,674)us-gaap_NetIncomeLoss	$ (6,397)us-gaap_NetIncomeLoss	$ 4,877us-gaap_NetIncomeLoss	$ 1,831us-gaap_NetIncomeLoss	$ (497)us-gaap_NetIncomeLoss	$ (7,526)us-gaap_NetIncomeLoss	$ (186)us-gaap_NetIncomeLoss	$ 5,392us-gaap_NetIncomeLoss
Denominator:
Weighted-average common shares outstanding (shares)									28,707	29,169	25,566
Basic earnings (loss) per common share (usd per share)	$ (0.08)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.05)us-gaap_EarningsPerShareBasic	$ (0.12)us-gaap_EarningsPerShareBasic	$ (0.22)us-gaap_EarningsPerShareBasic	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (0.02)us-gaap_EarningsPerShareBasic	$ (0.26)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Numerator:
Net income (loss)	$ (2,145)us-gaap_NetIncomeLoss	$ (239)us-gaap_NetIncomeLoss	$ (1,468)us-gaap_NetIncomeLoss	$ (3,674)us-gaap_NetIncomeLoss	$ (6,397)us-gaap_NetIncomeLoss	$ 4,877us-gaap_NetIncomeLoss	$ 1,831us-gaap_NetIncomeLoss	$ (497)us-gaap_NetIncomeLoss	$ (7,526)us-gaap_NetIncomeLoss	$ (186)us-gaap_NetIncomeLoss	$ 5,392us-gaap_NetIncomeLoss
Denominator:
Weighted-average common shares outstanding (shares)									28,707	29,169	25,566
Incremental shares from stock-based compensation plans (shares)									0	0	571
Denominator for diluted earnings (loss) per common share (shares)									28,707	29,169	26,137
Diluted earnings (loss) per common share (usd per share)	$ (0.08)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.05)us-gaap_EarningsPerShareDiluted	$ (0.12)us-gaap_EarningsPerShareDiluted	$ (0.22)us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ (0.02)us-gaap_EarningsPerShareDiluted	$ (0.26)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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