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Segments Segments (External Customer Sales By Product) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue from External Customer [Line Items]                      
Total net sales $ 747,574 $ 821,204 $ 797,547 $ 727,418 $ 510,162 $ 416,471 $ 357,287 $ 292,826 $ 3,093,743 $ 1,576,746 $ 1,311,498
Structural components [Member]                      
Revenue from External Customer [Line Items]                      
Total net sales                 471,619 249,371 205,036
Lumber & lumber sheet goods [Member]                      
Revenue from External Customer [Line Items]                      
Total net sales                 921,304 459,446 428,084
Millwork, Doors And Windows [Member]                      
Revenue from External Customer [Line Items]                      
Total net sales                 898,769 442,675 328,063
Other building products & services [Member]                      
Revenue from External Customer [Line Items]                      
Total net sales                 $ 802,051 $ 425,254 $ 350,315