Long Term Obligations (Fan Pier Leases) (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2011 ft² lease building
Depreciation expense	$ 60,000	$ 62,300	$ 47,300
Rental expense	18,100	38,900	57,700
Property and equipment, net	697,715	715,812
Construction financing lease obligation, current and noncurrent	473,000	473,400
Fan Pier Leases
Number of leases | lease				2
Area of real estate property (in square feet) | ft²				1.1
Lease agreements number of buildings | building				2
Optional term of lease agreement (in years)				10 years
Buildings | Fan Pier Leases
Interest expense	60,200	60,200	12,400
Depreciation expense	13,300	13,400	2,600
Rental expense	6,500	6,500	$ 6,500
Construction-in-process
Property and equipment, net	$ 502,300	$ 515,000