Earnings Per Share - Basic and Diluted Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income - Basic and Diluted	$ 7,765	$ 3,606
Impact of assumed conversions:
Weighted average common shares outstanding - Basic	48,582	47,669
Assumed conversions:
Incremental common shares from warrants	1,411	1,699
Incremental common shares from stock options	1,142	972
Incremental common shares from restricted stock units	87	0
Weighted average common shares outstanding - Diluted	51,222	50,340
Basic earnings per common share	$ 0.16	$ 0.08
Diluted earnings per common share	$ 0.15	$ 0.07

Incremental common shares from restricted stock units.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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