International Operations and Geographic Information (Schedule of Geographic Net Sales and Location of Long-lived assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 676,836	$ 628,402	$ 603,593
Long-Lived Assets	100,852	97,633	104,898
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	444,151	401,415	381,390
Long-Lived Assets	42,053	46,749	52,262
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	36,892	40,734	39,967
Long-Lived Assets	19,718	13,809	13,511
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	97,958	92,964	101,124
Long-Lived Assets	25,751	25,166	26,746
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	45,045	36,190	26,029
Long-Lived Assets	12,562	11,719	12,221
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,517	10,225	14,171
Long-Lived Assets	768	190	158
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 41,273	$ 46,874	$ 40,912