Warranty and Options Activity (Details) (Stock Options and Warrants, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options and Warrants
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding [Roll Forward]
Underlying Shares - Outstanding at beginning of year	2,109	2,292	3,567
Underlying Shares - Granted	0	90	0
Underlying Shares - Exercised	(474)	(273)	(1,275)
Underlying Shares - Outstanding at end of year	1,635	2,109	2,292
Underlying Shares - Exercisable at end of year	1,512	1,950	2,180
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price - Outstanding at beginning of year	$ 16.39	$ 14.63	$ 14.25
Weighted-Average Exercise Price - Granted	$ 0.00	$ 39.11	$ 0.00
Weighted-Average Exercise Price - Exercised	$ 9.06	$ 9.08	$ 13.57
Weighted-Average Exercise Price - Outstanding at end of year	$ 18.51	$ 16.39	$ 14.63
Weighted-Average Exercise Price - Exercisable at end of year	$ 17.35	$ 15.48	$ 15.27

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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