v2.4.0.8
Computation of Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                            
Net Income (Loss) Attributable to Parent $ 73,445 $ 62,188 [1] $ 54,048 [1] $ 63,998 [1] $ 80,991 [1] $ 56,145 $ 49,231 $ 46,706 $ 58,182 $ 233,759 $ 199,037 $ 261,225 $ 210,264 $ 169,071
Income from continuing operations                       $ 261,225 $ 210,264 $ 167,118
Denominator for basic earnings per share—Weighted-average shares outstanding 300,223   296,437             299,213 295,338 295,810 292,252 286,542
Effect of dilutive securities:                            
RSUs 883   430             775 436 479 182 0
Stock options 3,564   4,241             3,765 4,398 4,346 4,250 5,118
Restricted stock 15   64             18 54 58 66 54
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding 304,685   301,172             303,771 300,226 300,693 296,750 291,714
Basic earnings per share from continuing operations                       $ 0.88 [2] $ 0.72 [2] $ 0.58 [2]
Diluted earnings per share from continuing operations                       $ 0.87 [2] $ 0.71 [2] $ 0.57 [2]
Earnings Per Share, Basic $ 0.24 $ 0.21 [1] $ 0.18 [1] $ 0.22 [1] $ 0.28 [1] $ 0.19 [1] $ 0.17 [1] $ 0.16 [1] $ 0.20 [1] $ 0.78 $ 0.67 $ 0.88 [2] $ 0.72 [2] $ 0.59 [2]
Earnings Per Share, Diluted $ 0.24 $ 0.21 [1] $ 0.18 [1] $ 0.21 [1] $ 0.27 [1] $ 0.19 [1] $ 0.17 [1] $ 0.16 [1] $ 0.20 [1] $ 0.77 $ 0.66 $ 0.87 [2] $ 0.71 [2] $ 0.58 [2]
[1] Gross margin and operating income during the quarters ended March 31, 2012, June 30, 2012, September 30, 2012 and December 31, 2012 include gains of $8.3 million, $8.4 million, $0.5 million and $0.7 million, respectively, resulting from lawsuit settlements with certain of our aftermarket product suppliers as discussed in Note 8, "Commitments and Contingencies."
[2] The sum of the individual earnings per share amounts may not equal the total due to rounding.