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Share-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations

The following table shows the detail of share-based compensation by line item in the consolidated statements of operations for the years ended December 31, 2012, 2011 and 2010 and the assumptions for each of these years in which grants were awarded:

(U.S. Dollars, in thousands, except assumptions)		Year Ended December 31, 2012				Year Ended December 31, 2011				Year Ended December 31, 2010 (1)
Cost of sales		$	592			$	153			$	210
Sales and marketing			1,550				2,031				3,505
General and administrative			4,023				4,322				4,105
Research and development			138				142				318
Total		$	6,303			$	6,648			$	8,138

(U.S. Dollars, in thousands, except assumptions)		Year Ended December 31, 2012		Year Ended December 31, 2011		Year Ended December 31, 2010 (1)
Assumptions:
Expected term		4.50 years		4.58 years			—
Expected volatility		50.9% – 51.8%		49.6% – 49.9%			—
Risk free interest rate		0.76% – 0.84%		0.90% – 2.26%			—
Dividend rate		—		—			—
Weighted average fair value of options granted during the year		$16.99		$14.21		$	—

(1) The Company did not grant any options during 2010.

Schedule of Stock Option Activity

Summaries of the status of the Company’s stock option plans as of December 31, 2012 and 2011 and changes during the year ended December 31, 2012 are presented below:

		Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term
Outstanding at December 31, 2011			2,559,272			$	33.41
Granted			347,250			$	40.46
Exercised			(716,564	)		$	31.50
Forfeited			(244,003	)		$	40.50
Outstanding at December 31, 2012			1,945,955			$	34.50				5.39
Vested and expected to vest at December 31, 2012			1,903,616			$	34.42				5.31
Options exercisable at December 31, 2012			1,448,293								4.20

Schedule of Stock Options Outstanding and Exercisable by Price Range

Outstanding and exercisable by price range as of December 31, 2012

		Options Outstanding												Options Exercisable
Range of Exercise Prices		Number Outstanding				Weighted Average Remaining Contractual Life				Weighted Average Exercise Price				Number Exercisable				Weighted Average Exercise Price
$10.42 – $25.01			253,661				5.09			$	23.40				253,661			$	23.40
$25.05 – $28.95			326,383				5.30			$	26.96				314,383			$	26.97
$29.23 – $33.01			314,433				6.84			$	31.60				167,102			$	31.44
$33.08 – $38.11			347,859				3.50			$	37.49				307,194			$	37.51
$38.40 – $39.94			282,687				6.61			$	39.68				126,687			$	39.69
$40.27 – $41.37			210,000				7.05			$	41.22				68,334			$	41.20
$43.04 – $45.84			188,932				3.47			$	44.63				188,932			$	44.63
$50.15 – $50.15			12,500				4.29			$	50.15				12,500			$	50.15
$50.50 – $50.50			2,000				4.01			$	50.50				2,000			$	50.50
$50.99 – $50.99			7,500				4.04			$	50.99				7,500			$	50.99
$10.42 – $50.99			1,945,955				5.39			$	34.50				1,448,293			$	33.54

Schedule of Changes in Restricted Stock

A summary of the status of our restricted stock as of December 31, 2012 and 2011 and changes during the year ended December 31, 2012 are presented below:

		Shares				Weighted Average Grant Date Fair Value
Non-vested as of December 31, 2011			69,000			$	29.23
Granted			149,500			$	40.93
Vested			(28,336	)		$	29.23
Cancelled			(29,333	)		$	38.87
Non-vested as of December 31, 2012			160,831			$	38.34

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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