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Earnings per Share Basis and Diluted (Details) (USD $) In Thousands, except 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	$ (17,459)us-gaap_NetIncomeLoss	$ (3,734)us-gaap_NetIncomeLoss	$ (6,996)us-gaap_NetIncomeLoss	$ (8,455)us-gaap_NetIncomeLoss	$ 139us-gaap_NetIncomeLoss	$ 993us-gaap_NetIncomeLoss	$ 580us-gaap_NetIncomeLoss	$ 1,734us-gaap_NetIncomeLoss	$ (36,644)us-gaap_NetIncomeLoss	$ 3,446us-gaap_NetIncomeLoss	$ 4,966us-gaap_NetIncomeLoss
Denominator
Weighted average shares (basic)									28,915,496us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,004,019us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,365,731us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of potential common shares									0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	2,110,354us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,054,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted Average Number of Shares Outstanding, Diluted									28,915,496us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	30,114,373us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,419,956us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ (0.60)us-gaap_EarningsPerShareBasic	$ (0.13)us-gaap_EarningsPerShareBasic	$ (0.24)us-gaap_EarningsPerShareBasic	$ (0.29)us-gaap_EarningsPerShareBasic	$ 0.00us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (1.27)us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ (0.60)us-gaap_EarningsPerShareDiluted	$ (0.13)us-gaap_EarningsPerShareDiluted	$ (0.24)us-gaap_EarningsPerShareDiluted	$ (0.29)us-gaap_EarningsPerShareDiluted	$ 0.00us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ (1.27)us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted
Antidilutive potential common shares excluded from computation of earnings per share									452,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	14,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	416,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Debt Instrument, Convertible, Stock Price Trigger									$ 33.79us-gaap_DebtInstrumentConvertibleStockPriceTrigger

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