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Earnings Per Share (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income	$ 8,744	$ 8,734	$ 6,007	$ 17,478	$ 11,019
Denominator:
Weighted averages shares outstanding	27,858		27,548,000	27,740	27,538
Total basic and diluted earnings per share	28,737		27,838	28,544	27,813
Stock Options [Member]
Denominator:
Assumed exercise of stock options	879		290	804	275

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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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