Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property and equipment
Gross property and equipment	$ 273,539	$ 194,950
Less accumulated depreciation and amortization	99,473	69,580
Net property and equipment	174,066	125,370
Land
Property and equipment
Gross property and equipment	19,954	19,954
Machinery and equipment
Property and equipment
Gross property and equipment	84,941	67,582
Furniture and fixtures
Property and equipment
Gross property and equipment	25,961	22,280
Leasehold improvements
Property and equipment
Gross property and equipment	$ 142,683	$ 85,134