Inventories - Major Components of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories [Abstract]
Raw materials and purchased components	$ 81,721	$ 70,552
Service parts, garments and accessories	95,219	95,110
Finished goods	213,116	196,691
Less: reserves	(19,200)	(17,357)
Inventories	$ 370,856	$ 344,996