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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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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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Note 4 - Earnings Per Share (Details) - Earnings Per Share - Basic and Diluted Loss Per Share (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	$ 14,639us-gaap_NetIncomeLoss	$ 15,458us-gaap_NetIncomeLoss	$ 21,542us-gaap_NetIncomeLoss	$ 11,504us-gaap_NetIncomeLoss	$ 30,709us-gaap_NetIncomeLoss	$ 36,251us-gaap_NetIncomeLoss	$ 224,909us-gaap_NetIncomeLoss	$ 22,516us-gaap_NetIncomeLoss	$ 63,143us-gaap_NetIncomeLoss	$ 314,385us-gaap_NetIncomeLoss	$ 62,699us-gaap_NetIncomeLoss
Less: distributed earnings allocated to participating securities									(196)		(1,101)
Less: undistributed earnings allocated to participating securities									(60)	(4,917)
Net income attributable to common stockholders (numerator for basic earnings per share)									62,887	309,468	61,598
Add back: undistributed earnings allocated to participating securities									60	4,917
Less: undistributed earnings reallocated to participating securities									(60)	(4,879)
Numerator for diluted earnings per share under two class method									$ 62,887	$ 309,506	$ 61,598
Denominator
Weighted-average common shares outstanding (in Shares)									48,615,541	48,453,119	47,660,629
Denominator for diluted earnings per share under two class method (in Shares)									48,817,566	48,831,785	47,834,156
Basic Earnings Per Common Share (in Dollars per share)	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.62us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 4.60us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic	$ 6.39us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic
Diluted Earnings Per Common Share (in Dollars per share)	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 4.56us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 1.29us-gaap_EarningsPerShareDiluted	$ 6.34us-gaap_EarningsPerShareDiluted	$ 1.29us-gaap_EarningsPerShareDiluted
Employee Stock Option [Member]
Denominator
Add: dilutive effect of stock options (in Shares)									202,025	378,666	173,527