Commitments and Contingencies - Operating Leases (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jul. 31, 2014 Office Building Lease	Jul. 31, 2014 Office Building Lease Letter of Credit October, 2019 to October, 2025
Operating Leases
Lease term					15 years
Future minimum payments
Six months ending December 31, 2014	$ 1,337,000		$ 1,337,000
2015	5,149,000		5,149,000
2016	5,922,000		5,922,000
2017	5,201,000		5,201,000
2018	5,530,000		5,530,000
Thereafter	37,008,000		37,008,000
Total minimum lease payments	60,147,000		60,147,000		36,300,000
Rent expense and other operating lease disclosures
Rent expense	700,000	700,000	1,300,000	1,300,000
Irrevocable stand-by letter of credit					3,500,000
Minimum requirement for letter of credit that is subject to annual reduction						$ 1,200,000