Commitments and Contingencies - Facility Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Facility Leases [Line Items]
2014	$ 17,726,000
2015	18,107,000
2016	18,498,000
2017	18,897,000
2018	19,307,000
Thereafter	211,741,000
Total	304,276,000
Facility lease obligations [Abstract]
Interest expense in connection with facility lease obligation	16,200,000	16,000,000	15,600,000
Facility lease obligation, including reimbursements		0	0
Facilities - Buildings A and B
Schedule of Facility Leases [Line Items]
2014	13,288,000
2015	13,545,000
2016	13,809,000
2017	14,079,000
2018	14,356,000
Thereafter	146,667,000
Total	215,744,000
Facility lease obligations [Abstract]
Imputed interest rate applicable to facility lease obligation	11.00%
Facility lease obligation, including reimbursements	111,200,000	112,000,000
Facilities - Building C
Schedule of Facility Leases [Line Items]
2014	4,438,000
2015	4,562,000
2016	4,689,000
2017	4,818,000
2018	4,951,000
Thereafter	65,074,000
Total	88,532,000
Facility lease obligations [Abstract]
Imputed interest rate applicable to facility lease obligation	9.00%
Facility lease obligation, including reimbursements	49,100,000	48,800,000
Facilities Building D and E
Facility lease obligations [Abstract]
Facility lease obligation, including reimbursements	$ 25,000,000