XML 49 R72.htm IDEA: XBRL DOCUMENT v2.4.0.6
Selected Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue $ 762,775 $ 752,179 $ 751,201 $ 485,379 $ 479,913 $ 478,417 $ 458,113 $ 417,294 $ 2,751,534 $ 1,833,737 $ 1,510,970
Gross margin 83,811 86,701 84,729 57,307 56,642 57,397 50,576 48,818 312,548 213,433 185,690
Operating income 27,138 26,643 23,918 16,760 19,218 20,707 15,715 14,242 94,459 69,882 55,531
Net income 17,014 16,276 14,390 10,498 12,509 12,617 9,630 8,702 58,178 43,458 34,265
Basic earnings per share $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 0.34 $ 0.34 $ 0.26 $ 0.23 $ 1.58 $ 1.17 $ 0.92
Diluted earnings per share $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 0.34 $ 0.34 $ 0.26 $ 0.23 $ 1.57 $ 1.16 $ 0.91
Restatement Adjustment [Member]
                      
Revenue   (8,200) (8,500)                
Gross margin   (20) (20)                
As Previously Reported [Member]
                      
Revenue   760,379 759,709                
Gross margin   86,722 84,753                
Operating income   26,643 23,918                
Net income   $ 16,276 $ 14,390                
Basic earnings per share   $ 0.44 $ 0.39                
Diluted earnings per share   $ 0.44 $ 0.39