Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Income Statement Recognition Of Share-Based Compensation

	Three-Month Periods Ended March 31,
	2012		2011
Cost of revenue	$	146	$	128
Selling, general and administrative		1,922		1,795
Research and development		100		82
Share-based compensation	$	2,168	$	2,005

Service Award Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Share-Based Compensation Activity Other Than Stock Option

	Three-Month Period Ended March 31, 2012		Three-Month Period Ended March 31, 2011
Number of service award shares granted during the period		—		18,434
Weighted average grant-date fair value per share granted during the period		—	$	42.72
Fair value of service award shares vested during the period	$	448	$	683

Performance Award Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Share-Based Compensation Activity Other Than Stock Option

	Three-Month Period Ended March 31, 2012		Three-Month Period Ended March 31, 2011
Number of performance award shares granted during the period		34,229		22,511
Weighted average grant-date fair value per share during the period	$	33.87	$	44.44
Fair value of performance award shares vested during the period	$	522	$	389

Board DSUs And Dividend Equivalents Granted To Board [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Share-Based Compensation Activity Other Than Stock Option

Board DSUs and Dividend Equivalents Granted to Board	Three-Month Period Ended March 31, 2012		Three-Month Period Ended March 31, 2011
Number of shares granted during the period		1,286		1,420
Weighted-average grant date fair value per share during the period	$	36.74	$	39.43
Fair value of shares vested during the period	$	102	$	116

Chief Executive Officer [Member] | DSU Service Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Share-Based Compensation Activity Other Than Stock Option

Service DSU's Granted to CEO	Three-Month Period Ended March 31, 2012		Three-Month Period Ended March 31, 2011
Number of shares granted during the period		1,283		900
Weighted-average grant date fair value per share granted during the period	$	34.03	$	44.44
Fair value of shares vested during the period	$	572	$	704

Chief Executive Officer [Member] | DSU Performance Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Share-Based Compensation Activity Other Than Stock Option

Performance DSU's Granted to CEO	Three-Month Period Ended March 31, 2012		Three-Month Period Ended March 31, 2011
Number of shares granted during the period		59,049		24,122
Weighted-average grant date fair value per share granted during the period	$	33.87	$	44.44
Fair value of shares vested during the period	$	396	$	227