Capital Lease (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Component of Operating Other Cost and Expense [Line Items]
Lease term	15 years
Base rent per square foot (in dollars per square foot)	18
Lease expense	$ 1,200,000	$ 1,100,000	$ 1,100,000	$ 1,100,000
Accumulated amortization on the leased property	4,000,000	3,800,000
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	1,175,000
2015	1,080,000
2016	1,080,000
2017	1,080,000
2018	1,080,000
Thereafter	10,800,000
Total minimum obligations	16,295,000
Interest	10,965,000
Present value of net obligations	5,330,000
Capital Leases, Future Minimum Payments Due	1,080,000
Future sublease rentals	1,100,000
Term of capital lease sublease rentals	10 years
Estimated annual operating expenses to be borne by the Company	$ 800,000