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Quarterly results of operations (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 393,733 $ 390,192 $ 367,887 $ 372,999 $ 330,165 $ 347,767 $ 373,512 $ 363,489 $ 1,524,811 $ 1,414,933 $ 1,128,131
Cost of sales 272,968 265,021 253,404 258,193 232,847 231,273 250,710 237,046 1,049,586 951,876 765,670
Gross profit 120,765 125,171 114,483 114,806 97,318 116,494 122,802 126,443 475,225 463,057 362,461
Total operating expenses 67,866 72,179 67,345 65,593 59,393 53,590 52,964 56,230 272,983 222,177 201,848
Earnings from equity investment 4,366 2,946 0 0         7,312 0 0
Operating income 57,265 55,938 47,138 49,213 37,925 62,904 69,838 70,213 209,554 240,880 160,613
Total other expense 8,613 8,833 4,130 1,896 3,954 4,356 3,958 5,817 23,472 18,085 19,910
Income before income taxes 48,652 47,105 43,008 47,317 33,971 58,548 65,880 64,396 186,082 222,795 140,703
Provision for income tax expense 14,107 13,924 13,068 15,379 10,033 17,605 21,742 21,885 56,478 71,265 47,110
Net income 34,545 33,181 29,940 31,938 23,938 40,943 44,138 42,511 129,604 151,530 93,593
Less: Income (loss) attributable to noncontrolling interest 6 40 21 (2) 8 20 17 29 65 74 251
Net income attributable to common stockholders $ 34,539 $ 33,141 $ 29,919 $ 31,940 $ 23,930 $ 40,923 $ 44,121 $ 42,482 $ 129,539 $ 151,456 $ 93,342
Weighted average shares outstanding                      
Basic (in shares) 91,743 91,443 91,032 88,533 86,077 84,993 82,495 67,960 90,697 80,111 63,270
Diluted (in shares) 94,936 94,734 94,606 94,356 93,355 92,339 89,794 74,741 94,604 86,937 67,488
Earnings per share                      
Basic (in dollars per share) $ 0.38 $ 0.36 $ 0.33 $ 0.36 $ 0.28 $ 0.48 $ 0.53 $ 0.63 $ 1.43 $ 1.89 $ 1.48
Diluted (in dollars per share) $ 0.36 $ 0.35 $ 0.32 $ 0.34 $ 0.26 $ 0.44 $ 0.49 $ 0.57 $ 1.37 $ 1.74 $ 1.38