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Earnings (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net Income (Loss)	$ 9,502us-gaap_NetIncomeLoss	$ 7,804us-gaap_NetIncomeLoss
Denominator:
Weighted-average common shares outstanding, Basic (in shares)	115,336us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,590us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of potential dilutive common shares	2,106us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	3,039us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator:
Weighted-average common shares outstanding, Diluted (in shares)	117,442us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	116,629us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Basic	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted

X

- Definition

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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