Long-term Obligations (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2011 leases squarefeet building	Dec. 31, 2013
Long-term Debt and Capital Lease Obligations [Abstract]
Number of leases (leases)		2
Area of leased property (in square feet)		1,100,000
Number of buildings under lease agreement (buildings)		2
Optional term of lease agreement (in years)		10 years
Construction in progress	$ 525,500,000		$ 503,400,000
Construction Financing Obligation	473,700,000
Construction financing lease obligation	473,360,000		440,937,000
Interest rate, low end of range (percent)	2.00%
Interest rate, high end of range (percent)	9.00%
Amount outstanding on line of credit	$ 31,900,000
Term of Line of Credit Facility	1 year