Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 790,058	$ 766,607	$ 637,454
Long-lived assets	616,436	603,201	568,513
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	741,675	708,917	585,549
Long-lived assets	582,914	569,038	531,740
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	48,383	57,690	51,905
Long-lived assets	$ 33,522	$ 34,163	$ 36,773