Leasehold Improvements, Equipment, Construction in Progress and Land, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	$ 77,572		$ 77,572		$ 73,255
Less accumulated depreciation and amortization	(37,449)		(37,449)		(34,917)
Leasehold improvements, equipment and construction in progress, net	40,123		40,123		38,338
Land	1,672		1,672		1,672
Leasehold improvements, equipment, land and construction in progress, net	41,795		41,795		40,010
Depreciation expense	2,504	1,121	5,216	2,163
Gains (loss)on sale and abandonment of leasehold improvements and equipment	(675)	44	(671)	48
Equipment
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	30,450		30,450		28,498
Equipment | Minimum
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			2 years
Equipment | Maximum
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			5 years
Software
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	16,225		16,225		15,031
Software | Minimum
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			3 years
Software | Maximum
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			10 years
Vehicles
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			4 years
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	7,240		7,240		9,353
Other
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			10 years
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	516		516		367
Leasehold improvements
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	18,450		18,450		17,920
Leasehold improvements | Maximum
Leasehold Improvements, Equipment and Construction in Progress and Land, Net
Ranges of Estimated useful life			10 years
Construction in progress
Leasehold Improvements, Equipment and Construction in Progress, Net
Leasehold improvements, equipment and construction in progress, gross	$ 4,691		$ 4,691		$ 2,086