Segments Segments (External Customer Sales By Product) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Total net sales	$ 317,087	$ 354,060	$ 344,586	$ 279,983	$ 305,190	$ 328,468	$ 314,653	$ 248,726	$ 1,295,716	$ 1,197,037	$ 942,398
Structural components [Member]
Revenue from External Customer [Line Items]
Total net sales									175,051	157,975	106,745
Millwork & other interior products [Member]
Revenue from External Customer [Line Items]
Total net sales									241,283	219,191	178,449
Lumber & lumber sheet goods [Member]
Revenue from External Customer [Line Items]
Total net sales									447,565	428,384	333,952
Windows & other exterior products [Member]
Revenue from External Customer [Line Items]
Total net sales									271,300	249,711	202,532
Other building products & services [Member]
Revenue from External Customer [Line Items]
Total net sales									$ 160,517	$ 141,776	$ 120,720