Summary of Property & Equipment (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Property And Equipment [Abstract]
Machinery and equipment	$ 68,713,000		$ 68,005,000
Leashold improvements	88,653,000		65,338,000
Furniture, fixtures, and other	20,827,000		16,196,000
Construction-in-progress	8,766,000		7,902,000
Property and equipment, gross	186,959,000	[1]	157,441,000	[1]
Less: Accumulated depreciation	(104,718,000)	[2]	(89,757,000)	[2]
Property and equipment, net	82,241,000		67,684,000
Gross equipment held under capital leases	100,000		300,000
Depreciation for equipment held under capital leases	$ 100,000		$ 300,000

[1] Includes $0.1 million and $0.3 million of certain equipment held under capital leases and classified as equipment as of December 31, 2012 and 2011, respectively.

[2] Includes $0.1 million and $0.3 million of accumulated depreciation related to certain equipment held under capital leases, as of December 31, 2012 and 2011, respectively, which are depreciated using the straight-line method over the lease term.