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, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 879,577	$ 839,055	$ 682,090
Long-lived assets	239,301	235,684	100,852
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	635,923	571,817	449,119
Long-lived assets	174,811	168,404	42,053
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	59,621	58,976	36,892
Long-lived assets	20,338	20,840	19,718
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	80,762	93,699	97,959
Long-lived assets	18,755	21,728	25,751
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	44,388	54,087	45,212
Long-lived assets	21,466	23,354	12,562
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	13,801	13,702	11,519
Long-lived assets	1,189	1,358	768
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	45,082	46,774	41,389
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,742	$ 0	$ 0