International Operations and Geographic Information (Schedule of Geographic Net Sales and Location of Long-lived assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 844,748	$ 879,577	$ 839,055
Long-lived assets	224,190	239,301	235,684
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	615,028	635,923	571,817
Long-lived assets	166,707	174,811	168,404
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	45,184	59,621	58,976
Long-lived assets	16,254	20,338	20,840
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	79,070	80,762	93,699
Long-lived assets	16,772	18,755	21,728
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	48,357	44,388	54,087
Long-lived assets	19,435	21,466	23,354
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	13,580	13,801	13,702
Long-lived assets	1,401	1,189	1,358
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	43,529	45,082	46,774
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 3,621	$ 2,742	$ 0