Segment and Geographic Information Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 500,248	$ 461,091
Net sales	1,794,962	1,653,921	1,563,342
UNITED STATES
Segment Reporting Information [Line Items]
Long-Lived Assets	419,457	373,268
North America [Member]
Segment Reporting Information [Line Items]
Net sales	1,576,041	1,442,475	1,415,370
Europe
Segment Reporting Information [Line Items]
Net sales	117,686	107,297	99,187
Middle East
Segment Reporting Information [Line Items]
Net sales	4,378	39,357	4,023
Asia
Segment Reporting Information [Line Items]
Net sales	29,115	32,414	29,196
Oceania
Segment Reporting Information [Line Items]
Net sales	65,122	28,892	10,249
Other [Member]
Segment Reporting Information [Line Items]
Net sales	2,620	3,486	5,317
UNITED KINGDOM
Segment Reporting Information [Line Items]
Long-Lived Assets	60,175	64,585
GERMANY
Segment Reporting Information [Line Items]
Long-Lived Assets	18,842	20,260
MEXICO
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 1,774	$ 2,978